I won’t say, “I told you so,” mainly because you didn’t argue with me! But she is great, isn’t she? Especially when you consider her competition at the four-star yellow level. Glad she is also working out for you.
Besides war depth, I still favor this approach, because who wants to have a roster full of benchwarmers that you can never use because of the power drop between them and your best five in one color? That’s boring. I still don’t get as much variety as I would like, but I have at least one spot in all my mono teams that I try to vary based on the team I’m attacking, to say nothing of costume switches (looking at you Caedmon and Sonya).
I raid mono almost exclusively now, but in war, I still always go rainbow. Force of habit from before I had such a deep roster so I wouldn’t run out of one color. Anyway, I find that it’s not super unusual for me to one-shot six teams, and I can usually get four out of six, at least, during war with my rainbow squads. And my job is to go after the big dogs on the opposing side, as my roster is the most mature in my alliance. If I time it right, sometimes I can take out the top team four times, since our wars are usually 2 vs. 2 or 3 vs. 3. So rainbow is not dead. It’s quite viable, with good synergy. Sometimes you can’t find enough on-color tiles when you go mono. Sometimes you can’t assemble enough in any one color when you go rainbow. Them’s the breaks.