Of course, but that misses the point. It's not just about the weight they are right now, but about the frame and physicality. I'm referring to guys like Caufield, Zegras, Krebs, etc. who are smaller. Whereas a Cozens, who only weighs 180 right now, has the physical frame at 6'3 to fill out and go 210+ one day. But, then there are players who are already big - Kakko, Dach, Boldy and will get bigger and stronger as they move into the NHL weight room.
The '5'11 180' number was not specifying one player but was a generic reference.
But, we actually have seven forwards under 6 feet: Sobotka, Wilson, Sheary, Larsson, Skinner, Olafsson, and Rodriguez. And, depending on which site (ESPN, NHL) of the 14 forwards on the squad at the end of the year, only 5 were over 200 lbs, and 4 of those are listed right at 200-201 or so.
THere's just not a big physical presence on the front line. Small, fast players are fine; but when your whole forward lineup is average to under size you lose something. You don't bring much in the way of an intimidating physical presence. Sure, if everyone of them has the explosive offensive talent of a Kucherov or Brayden Point, you might get away with that (But Tampa Bay also got crushed in the playoffs).
But, I think it's important to have more players the size of a Matthews or Laine or Blake Wheeler (6'5, 225) to balance out some of our more smallish lineup and talent.
Look at Toronto, Washington, Winnipeg, St. Louis and several other playoff teams - they all have a number of front line players 6'2, 6'3, 6'4 + well over 200 lbs, with talent and who bring a significant physical presence to their teams. Something that really has been missing with the Sabres. It helps overall, it helps defensively, and if you get in the playoffs it helps with that long 2nd season grind.