Board Thread:Questions and Answers/@comment-27044094-20180307204726/@comment-24900075-20180308013231

That's not what he's saying. He's saying that in general, Crossovers, especially huge ones, can easily contradict eachother. An example above is if the verses each have their own tier 0s. There can't be more than 1 Tier 0.

Another problem are ruined characters; if the crossover'd characters are meant to be the canon ones but act completely different with uncharacteristic uses of their abilities and generally screwing the entire canon story up, then that's ruining the character.

You CAN make a massive crossover, heck I have a massive crossover of all the Kamen Riders as a verse. It's just that you have to make sure it all makes sense.