Nah, I can't agree with that
Yes, BBP are clearly supposed to be a dark mirrior/parallel but they are not 1:1, like Kuzan is almost confirmed to betray or leave BBP before Eos, for example, imo (i remember you disagree with that but im like locked in onto that) and Loki will not if he would join (even not in a "fake" instance like Sanji nami or robin given we have no more time)
Oda is never gonna break the Monster Trio dynamic, not even for a short beat, I gotta agree with
@Mr. Reloaded there
Loki can imo only ever join if it's made clear to the general audience (agenda/trolling fans do not matter, obviously) that Sanji and Zoro > Loki in power, however minute the gap might be, or it ain't happening