Reinhart may not be flashy and his speed is concerning, but he seems to be finding chemistry on Jack's wing. Personally, I think we can do better for Jack speed wise down the road, say in 4 or 5 years.
That's when I'd look to give Sam his own line. His size also somewhat concerns me, for now. But he looks to be developing into a premier play making forward/center. Never a bad thing if you are looking to roll 3 pure scoring lines.