Hell no, "beefing up" would be the biggest mistake he could do.
Something like 160 lbs is enough for him, which is just 10-12 more (5 kilos)
to his current weight.
to gain 5 Kilo(160lbs) is not very hard, most likely, when you make a break from daily heavy physik and rest your body like for a Month, you can gain 5 Kilo(11lbs) in that time space.
It´s a normal reaction from every Body, i lift up 2-4 tons a Day, when i make 4 weeks rest and eat normal i gain 5-10Kilos (11-20)pretty easy.
I think Verteeg and other shorties, proved for the NHL you need around 170-175(lbs) by the height around 5"10-5"11. But the best in the league with height 5"10-5"11 are around 185-200 Pounds.
But there is a need to be NHL ready to reach 170(lbs). I dont wanna see Heppo get wrecktrained into the Board, by wilson or Buflyn, where 220lbs smash 165lbs into the Board, what the result would be should be clear.
For the Hepponiemi Corsby sample up there ^.
Crosby 5"11 has 202lbs
Hagelin 5"11 has 186lbs
Hörnqvist 5"11 189
and to bring in near team example.
Malgin 5"9 has 178lbs
Trocheck 5"10 has 182lbs
Vatrano 5"9 has 209lbs
Finn example
Aho 5"11 has 172lbs and NHL ready