Coriolanus
Banned
They needed Steve for his Time gem.
We all saw what they did when that didn't work.
Going from what's in the wiki, the way the gems were split up was tony, ever the imbecile, wishing them out of existence, then PSYKE, gotcha, and divvying them up among the asshats.
Either way, the illumi-bros were more than content to add people that could carry their own weight, as seen by when they accepted Banner. Heck, they were more than glad to keep people that *couldn't* carry their weight around, as seen by them not mindwiping McCoy after the gems shattered.
There was never a good reason to refuse adding Nick to the roster. Or at least trying to add.