It depends on the draft year. This year is particularly good on defense, but it's not considered a great draft in general. Not all mid-first round picks are equal. So given the value and quality of this year's draft, Crouse is absolutely worth the 16th overall. But as I said, I don't think ARI would even do that deal, so there's certainly no chance they would do it for FLA's pick. They have more than enough picks already, and a pick that late is far too low for a legit 20-25+ goal scorer who's just now breaking through into the beginning of his prime.
He also absolutely not only fits what the Sabres need, but also fits their age window perfectly. He's a year younger than Alex Tuch and would bring a lot of those same elements, except may even have a higher ceiling and is quite a bit more physical. He's exactly the kind of playoff type player you need to win, and also the kind of character player every team wants.
It's not about letting VO slip away for nothing. It's about capitalizing on his value when it's possibly at its highest and getting some quality assets back in return for him, rather than possibly letting him slip away as a UFA if they don't agree on a long term extension and Olofsson goes to arbitration. I really like what VO has brought the last few years, but I just see him being redundant with Quinn and Peterka coming in next year, and others beyond that. I just don't see where he fits 2/3/4 years from now.