my 2 cent times.
each fighter has there own stage diffrent ki diffrent things.
when vegeta went super first time. he was more powerful then goku super.
Goku gains power super fast with training.
vegeta has to work harder to get same thing but because he worked so hard his super was alot more powerful then gokus was. when goku became super he worked on learning the insta trans and took it easy. Vegeta trained to almost near death
Being half blood a human/sayian
gohan starts off with Huge amount of power . But never learns to control it and has a fear.
trunks fights cause he has to. So he gains power almost as fast as goku but lacks the exp and common sense. *aka the pump up*
What is my point? this is
Gohan super 2 was a huge increase in power.
goku super 2. was alot more. and he trained it faster.
trunks ussj. Was more powerful then super 2 but slower
vegeta ussj. was just a a power up super one.
want to see how i came up with the half blood and power thing?
*watches the fusion*
Wow It took me years to master super sayian 3. but them kids did it in a short time. Look at them they are flying like they have master it for years.
The point of this is. There is really no Ussj. It is just a power up super 1. to do that power they had to lose some speed. even vegeta did. but it was not enough to matter to much.
when trunks went all the way the speed cost was way to much. But he gained the power he needed.
So way i see it is this
Cell games Goku was NOT super 2. He was close to it but did not have time to train in it. Also the fact that goku trained with gohan and saw the hidden power gohan had.Gohan was always crying saying i could not help my friends. Goku gave gohan the chance. Thats why when they was getting beat up. goku was saying i am sorry my friends i was stupid when he thought gohan did not want to fight.
So in terms goku could NOT beat cell for the simple fact that a korn told goku how powerful he is and korn let him know 5 times *maybe less* more powerful then him
It took alot of ki to do the warp kame. and cell regen it back like it was nothing. they could hurt cell using alot of ki. but regen screwed them.
Point of all this is. Half bloods gain power fast and start out high. But have a limit to how far they can go. *each chars diffrent*
Trunks limit was the ussj
vegeta has no limit *just takes him alot longer then goku. even then goku had a edge because he was dead and was able to train better*
Gohan limit was super 2 but had help for mystic
there