Predicting taco vaults

Is there a way to predict which four star covers (and colors) will be in future taco vaults?

I could be wrong, but I’m pretty sure one of the 2 is always the playable COT 4*, so this week Spider-Gwen and I thought the other one is based off the currently features/boosted list. But since mine has Mr F and he’s not boosted (but was 6/1-6/8) I can’t say for sure. Other one might be pure random.

I’m fairly sure the second is random, and is also randomized among players. Mine this week is IW blue

backing up the random claim, my second is a red Red Hulk (like the terrible UB40 song)

Appreciate the insight and confirmations.