SH are based on chinese zodiac :
Luffy > Monkey
Zoro > Tiger
Nami > Cat
Ussop > Chameleon (dragon/Snake)
Sanji > Goat
Franky > rhino (bull)
Brook > Giraffe (horse)
chopper > Tanuki which is called racoon dog in japanese (dog)
jimbei > wild boar (same face)
carrot > bunny
robin > hawk (bird/rooster)
There are some small differences but most of them fit the chinese zodiac perfectly.
So yes Zoro is Tiger, it's so obvious that i don't know why you want to argue. He is a lone wolf, assassin, dangerous.
This is a stretch, to be fair.
The cat isn't an "official" member of the Chinese zodiac, you ignore that Vivi is a dove, chameleon may fit the dragon only if we apply the "ryu" logic, hawk and rooster only have in common that they are birds (and Oda has been consistent with the symbology of this creature by using Marco to represent it because of the link between the hou-ou and the rooster/pheasant) and, overall, you seem to be cherry-picking the animals representing each member: depending on how well it fits your idea, you pick the animal from chapter 651, SBSs 20 and 50 or even make it up (why give Chopper the raccoon dog because of his running gag when he's associated to the reindeer and the red panda in the sources you use for the rest but Jinbe?).
Doesn't seem to exist a pattern consistent enough for you to assure that most of them fit the zodiac perfectly.