I highly highly doubt an arbitrator only gives him 100K more than McArthur.
If I'm the Leafs I sit Luke down and just repeatedly show him images of Horton in his prime, Clockwork Orange-style, strapped in. Do it for hours a day. Timmy slamming opponents into the wall, using his reach and strength to break up plays. Then send him out onto the ice.
Stralman had 6G, 34Pts in 73 games for the BJ's last season, logging 4th highest TOI/G on the team (3rd highest among dmen), and had the most PP time on the team.
And he's only 23.