Thats exactly why people compare his ability to do that with Jagr.He is much more advanced in term of puck poise and smarts than Mantha was in his draft year. Better skater as well and much better physical tools. In Slafkovsky you get a puck possession monster, he already works the boards better than most NHLers.
However when saying someone has ONE trait like Jagr people just lose their minds and think your saying Slafkovsky will have the same career as Jagr.