1. like i said he was already very injured i can see if your saying this and vegeta is healthy but he wasnt
2. cell was going to self destruct because that was the best way to destroy the planet becasue he was in his 2nd form and gohan would not of let him destroy it with his fist
3. he had the ki blast because cel thought it was over just like everybody else thought it was cell is very cocky why wait a week to go though the cell games because he thought he was invincible and thats why he probably did the ki blast to go off in a bang
4. if you cant see it then it is honestly your fault sorry if you cant accept that they can but still that is like saying mystic gohan cant destroy the planet because we have never seen it so like i said your reasoning makes no sense"
Well from what I read you were trying to paint that Yajirobe didn't do anything but a scratch, but he did have that moment of heroism that saved the cast from Vegeta with that tail cut, who wasn't at all weakened at the time.
Infact 10 times stronger I believe.
See like I said, you can't prove that, at all.
Cocky or not, if he wanted to make sure he'd win a fist to the ground would have done it, IF he could bust them with his fists. Again he doesn't even imply it, none of the cast does even at the end of DBZ.