So here are the rules of this omnitrix
Firstly it's kind of a recalibrated version of the OV omnitrix hence the similar touch dial.
When Ben added in the Matrix Core it completely changed appearance to encompass all it's new features.
With this it includes every single alien transformation that he has unlocked up until this point albiet the matrix core mutated versions.
The mistransformation glitch is gone..any mistransformation ben has comes from him just not paying attention to the alien he selected and a psuedo master control which allows him to switch from alien to alien with ease and a quick cooldown time.
The drawbacks are since The mutated transformations use wayyy more power than the regular omnitrix forms he runs the risk of draining the "battery". And since the core was never perfected staying transformed for too long as well as switching through aliens too frequently puts a huge physical strain on ben himself.
Now as for how the mutated forms themselves work..think of the ultimate aliens crossed with the anti trix aliens from the reboot.
So the Matrix core basically super evolves whatever species Bens selected to their natural evolutionary peak...so for example if Ben had a saiyan transformation it would evolve to a super saiyan 4 since as far as we know that is the peak of NATURAL saiyan evolution.(yes ik the god forms are stronger and i actually like them wayy more than 4 but those technically can't be achieved naturally by any saiyan)
If it was a human form it would either make them a meta human or activate the x gene.
So yeah the forms have to make some sense from an evolutionary standpoint to Ult Humungousaurs hand missles,Ult big chills Fire ice and Ult Wildmutts speaking don't count.
So after the alien is evolved they remain that way as long as the matrix core is part of the omnitrix..no turning it off and on like the ultimates. So like how the anti trix aliens are constantly mutated.
Also Ben gives his mutated forms new names just to differentiate them.













