I hate to use this card, cause i hate it

In GT... Baby, using Vegeta's body figured it out fast... didn't matter if Vegeta mastered it, Vegeta wasn't in control

And baby was more towards the brute side then intelligent

Not to mention, Goku (GT) in his young state mastered it it fast as well



Also in one of the movie (which is non canon, but the rules of Oozaru should apply)

Gohan was able to focus long enough to attack Turles, after hearing Goku's voice. That worked because there was a strong emotional connection between them.



Cell would be mindless for a few moments, and would defiantly rampage. The power boost from it would be unstoppable, even if his swing are wild and unfocused. Given the fact he is programmed to kill Goku & friends... the moment he saw/heard Goku would give him focus due to the connection they have... his programming to kill him.