Board Thread:Questions and Answers/@comment-2209832-20141104031143/@comment-26010249-20141117184444

Riderfan2150 wrote: It looks like Kenny has THE Omnitrix, or a replica of the true Omnitrix There is no replica of the omnitrix other than the one albedo made, but that was destroyed, the one albedo has now is a stabilizer with an evolutionary function, thus it can be called an ultimatrix.

Ken's omnitrix is Ben's old omnitrix for sure. After making the Biomnitrix, the Omnitrix must have been in a secure storage or probably with azmuth, then was given to Kenny on his 10th birthday with only 10 aliens unlocked. That's probably the most realistic explanation.