Another factor is that Draisaitl's $8.5M contract was signed on August 16, 2017 beginning in the 2017/18 season when the salary cap was $75.0M. Therefore his 8.5M deal took up 11.33% of the cap.
Converting that into current dollars, 11.33% of $79.5M cap = $9,010,000. And that doesn't take into account the cap should continue to rise with new teams and growth.
So basically, if Nylander is asking for 8.0-8.5, it's not quite Draisaitl money. Draisaitl money would be 9M. 8.5M is somewhere between Ehlers money and Daisaitl money, perhaps tilted slightly towards the latter, but nonetheless still in between the two.