Lol! Do you even Dragon Ball?
Seriously, did you watch/read Dragon Ball? Spikier hair doesn't mean SSjin 2. He was just in SSjin form. His hair seems to be spiky because of his base hair.
MSSjin Gohan would still rival and would be close to MSSjin Goku, who was above SSjin Vegeta who was as strong, or a bit stronger than SSjin Trunks. Gohan would take this fight.
In that particular fight, when he fought Cell in the future, he was in just SSjin.
And please don't go and pull numbers out of nowhere.
Nope, he was in SSjin, in that fight. But he does use SSjinG2 (Grade 2), and even SSjinG3 (Grade).