The non reveal of the hybrid form is Oda's writing fault, since he is keeping them for later, when they will have their "official" vs.
The same happened with several things (Adv CoC wasnt showed in WCI with BM, or some hint with Katakuri, Chopper powerup didnt exist in WCI).
Jack taking L's is not a problem and it not makes look him bad since the L's are against superior enemies (Admirals -> actually here he should have died, but again Oda doing some things which not makes sense, I mean, Fujitora only needed to flip his ship and gg; InuNeko, numerical advantage + he fought an army of minks previously and he was in his worst form while Dukes in their best).
The example of Marco does not make any sense. Marco is individually above King/Queen, so him doing that in one moment of the "fight" with the advantage of his fruit is not something impressive actually. And you can't compare it with Jack who just ended his fights with the minks and the dukes "sneaked" on him suddenly, and he doesnt have here a fake logia body, so it was unavoidable. Totally different situations.
And we don't know the exact situation right now in his fight with Inu, so why bringing up this?
So the treatment is good for who he was, the "little brotther" in the All Stars. It's actually beyond good (since he survived, without any logical explanation, against a gravity user in the sea).
