Lesnar's push was definitely bigger than Austin & Cena.
Are you talking about initial push or after they had already been on top?
push to the top...when you are declared THE MAN and your run until that end. Austin's push would have started post Wrestlemania 13 thru say his injury before Summerslam 1999...hell even his comeback in 2000, the run up to Wrestlemania X7, his heel run in 2001 he was virtually unstoppable for the majority of his time on top.
go back and watch all the outlandish shyt they had Austin doing back then
I did say "slightly less" one difference I would say is Diesel never beat the previous top guy or guys clean like Austin would(HBK and Undertaker).Diesel and Shawn's pushes were every bit as big as Cena and Austin, the only difference was Diesel and Shawn were failures business-wise. Diesel held the title for a damn year.