Don't care for trying to make 2 good units when they haven't even had 1 for so long; zone entries have been a problem but Leafs need more shooting threats than Matthews on the flank. Marners been too predictable so I'd want to see him temporarily taken off his flank.
Hyman/Simmonds
Nylander - Tavares - Matthews
Sandin/Marner
Netfront I'd rather see Hyman than Simmonds because of his ability to win pucks down low to keep possession; Tavares is the best bumper option. Nylander & Matthews on the flanks can provide two legitimate scoring threats; both are excellent shooters & passers. Sandman is probably the best point option but I think Marner would be capable of playing that position. He has good poise, defensive instincts, & edgework; a 5-forward unit might be a bit of a defensive liability but if it gets them scoring it could be worth a try.