Board Thread:General Discussion/@comment-24578309-20141026141249/@comment-25413835-20141118021251

Mattwo wrote: That's not really a difference, especially considering Ken hacked his so he had the master control. Yeah but he still only had those 10 aliens. In the original series, master control only meant that he could transform from one alien to another without turning human again, he could transform without touching the omnitrix, and he could stay a an alien for how ever long he wanted. It had nothing to do with the number of aliens he had access to. Ben confirmed that he had over 70 aliens in Store 23, and had unlocked a lot more since then. By my count, he now has at least 80.

So giving Kenny his old omnitrix would give him access to 6-8 times more aliens than he did before.