Should Schenn stay or go back to Junior?

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I'll admit i've been a huge fan of Schenn for about 2 yrs now, I was estatic when Toronto got him at #5 as I probably would have picked him right after Stamkos! He's been a beast so far and maybe TO's best defensemen, should we send him back to junior or keep him up with the Leafs? (He can only play 9 games before we have to decide) What do you think will be better for his development? He has shown he can play