Here is Marner's agent leg to stand on and that is based on Marner's ability to lure an offersheet out of just 1 of the rest of the NHL GMs.
Offer sheet compensation is based on the average salary of the league, and CapFriendly has released the final numbers for this summer. Below is the full breakdown, with the contract’s average annual value placing it in one of seven tiers:
$1,339,575 or less .................... No compensation
$1,339,576 to $2,029,659 ....... Third-round pick
$2,029,660 to $4,059,322 ....... Second-round pick
$4,059,323 to $6,088,980 ...... First and third-round picks
$6,088,981 to $8,118,641 ....... First, second and third-round picks
$8,118,642 to $10,148,302 .... Two firsts, a second and third-round picks
Over $10,148,302 Four first-round picks
So if any NHL team is willing to give compensation picks in the terms of 2 X 1st + 2nd +3rd round pick that means that Marner's agent essentially has a 5 year X $10.148 AAV in his back pocket as leverage.
Why would Marner take less, if an OS and a Leafs matching would guarantee him >$10 mil?
PS. Its no secret that rumours of teams willing to OS Mitch have already surfaced in the public domain for open discussion. Darren Ferris Marner's agent leverage is OS thresholds.