Your thoughts sort of make sense except that it looks like Crosby might be a 100 point rookie. Are you saying the Phil has the potential to get more than 100pts next year? Have you looked at how many guys have accomplished this and who they are? When you say he has the potential to do more offensively than Crosby, that would also seem to include Savard, Yzerman, Messier, Jagr, Kovalchuk, Forsberg and every other player that didn't manage 100 points as an 18 year old, unless you are assuming that Crosby has peaked. I think Gretzky, Lemieux, and Hawerchuk are the only 100 point teenagers the NHL has seen and Crosby has a shot at being the 4th. Basically any star front line forward will be substantially better by age 22 or 23 than they were as a teenager so at today's scoring levels, Crosby can expect to do no worse than 130 points which is what Hawerchuk managed, although his failure to develop more is kind of a statistical anomally. Yzerman, Jagr, Gretzky, Sakic, and Lemieux all hugely improved on their teenage output and peak seasons of 150% or more of the rookie output are more the rule for elite scorers. I think the Hawerchuk career numbers are extremely unlikely because Crosby is the better player , but within the realm of possibility.
I know Kessel is very good but I can't see the logic in predicting he will score over 100 pts next year or surpass the success of every star Collegian that has preceeded him(because none have managed to do what Crosby seems to be doing this year). He doen't seem to have that much Gretzky in him.
Now if you were to say that he might score more goals than Crosby I could maybe see that as happening. Even Gretzky and Lemieux didn't lead th league in goal scoring every year.