more complex than that. Catalyst control is for the AMD/ATI GPUs, but AMD/ATI aren't the only once to produce cards for those GPUs. In the past they didnt even release the cards at all, but sold the chips to the likes of sapphire who would design the card around it. Those card manufacturers still make the cards, but because the catalyst has become more generic not all of the cards are compatible with all versions of the catalyst. It's a problem that goes in and out.
That's why I say, unless you really need the features of the catalyst, and there are very few things you need it for, there is no point risking it because the rollback game really gets boring after a while. Especially with a release every month now