Because Gaban showed that he knows Lokis true nature. He was just seeing how Luffy would react to the information about Loki. Since Luffy reminded him of Roger he showed Luffy where the key was.
2. The naming scheme is literally to show how much more powerful the attacks are in comparison to their previous versions. That’s the point of them. Saying it’s nothing is just cope.
3. Because thats not fun for Gaban?
I don’t know why you’re coping about this. We’re shown directly why Gaban did it.
1. Loki true nature is violence. Overall he's on a good side but if the sh's had pissed him off or stopped him from doing something he wants to do loki would kill them on first meeting. Loki offered to take out any crew didn't matter if they were good or bad or anything for freeing him. If someone else freed him and told him to take out the sh he'd had attacked the sh's and try to kill them. Loki is only good because he going along with luffy he has 0 issues with killing for really no reason. He'd be bad if he was with bb for example. Gaban understands this and freeing him is a risk if you can't defend yourself against him. He constantly warns the sh's about loki because loki is volatile then only fights when they wouldn't leave loki alone. He tried to talk them out of it and seeing that that wouldn't work he made sure they'd be able to protect themselves. If they were to weak he wouldn't have let them go until they were stronger aka he tested them seeing as they were determined to go to loki.
2. No higher number just means stronger attack not precise percentage of power. Agenda piece is striking again because ot makes gaban look stronger saying he only used 1% of his power vs luffy and zoro which is just dumb. In the example 360 pound cannon isn't 3 times weaker than 1080 pound cannon by damage output. 1 put a hole in a big fish smaller than the sunny while the other destroyed a structure many times bigger than the sunny. This is not a 3 times difference in output and it doesn't account for haki. Zoro didn't use haki on either attack. If he used it on 1080 pound cannon than it would even further get stronger showing it's not just 3 times while still being 1080 pound cannon. Naming scheme isn't meant to be taken literally it just to show higher number means stronger attack not exact percentage of power. Literally show anywhere that's been the case in op outside of trying to wank gaban. If gaban takes the haki mass off his attack is it still 100 times stronger? If put haki mass Yasotakeru is it still 1% of his power despite how much effort he has to put in? This is just silly man.
3. You said he only wanted to see g5 now he wants to have fun. You can't keep changing the motivation of gaban to suit you. If it was just to have fun why even talk at all and not just fight ? That would be the most interesting as they wouldn't have known who he was, would get shocked that he was a roger pirate, and then would have to deal with the confusion of why he's attacking him and forcinghim to bring out g5. That's the obviously more interesting route but he didn't do that so obviously isn't about him having fun. If it was just to see g5 he would've only asked to see it in exchange for the key. It's obvious his main motivation is the concern of how loki would act against them. He only chose to fight when they wouldn't leave loki alone. If they took his warning and left loki alone there wouldn't have even been a fight as loki was the primary reason. You are acting like loki is a angel who wouldn't hurt a fly instead of a dangerous pirate with no issues with hurting and killing other people for little to no reason.
4. Yea we did get shown because luffy and zoro got serious and shown there powers. He was testing them to see how strong they were and if they could handle loki. After seeing it he gave up. You are forgetting he has fs and probably seen what attacks they did and judged it was enough so surrendered. Yet again he knows he can't beat both and continuing the fight after seeing there powers was pointless he had enough that loki would beat them easily and they can defend themselves. You are acting like him commenting on g5 means it's his primary motivation but then ignore him commenting on the crew. It's obviously not just g5 he wanted to see. He commented on it because luffy used it. If luffy used g4 and adhaki the fight would have still ended because he wanted to see how strong they were and wouldn't die to a loki tantrum. Anyone seeing g5 for the first time will comment on it that doesn't make it the sole motivation for the characters because they acknowledged g5. Go reread 1139 and 1140 and tell me how g5 was the primary focus for gaban not the thier strength to survive loki.