You guys really want a Top tier lvl character in the crew, who is similar strong to Luffy, a Yonkou?
Big Mom thought she would crush anyone with Loki help,yet you want this guy in the crew, same guy even Gaban hyped beyond?
It wont happen, Jinbe or Yamato are different cases.
Both are not strong like Luffy, in fact Yamato barely could hold her own against Kaido after a few time, take in mind hybrid Kaido, not even drunken Kaido. G4 Adv CoC Luffy is clearly stronger than Yamato, same counts against Jinbe, let alone counting his G5.
And you have Loki who is simple not far away from Luffy pl, in fact probably equal.
In the end of Wano, Luffy would be easily able to low-mid diff Yamato at worst, so she joining wouldn´t change the power dynamic of the crew as
@Mr. Reloaded pointed it out.
At the end of WCi, Luffy was clearly stronger than Jinbe and would defeat him mid diff as he defeated Katakuri who would also mid diff Jinbe at worst.
In the end of Elbaph, Luffy wont be able to defeat Loki below high diff...
Loki would crush the monstertrio dynamic, a reason why Oda stall with Yamato because he want clearly Zoro and Sanji to be stronger than Yamato. That can´t work with Loki who is already one of the strongest top tiers.
Loki wont join, it wont happen.