You should be well aware that this is stupid. Remind us all how much you paid for Lehner and how his career compares to Holtby's.
That's good money chasing bad. How much we paid for Lehner is precisely why we won't overpay for a goaltender.
Holtby is unlikely to be available. If he is you're going to be adding significantly to a 0.5PPG AHL forward.
Nylander is in his D+2 season, which you're hoping nobody will realize. He should've played 2016-17 in the OHL (or in Sweden), but he didn't have a bad season in the AHL this year. His D+2 AHL PPG is nearly identical to guys like Kempe, Zibanejad, and J.T. Miller. And that's before you account for him not having a training camp due to injury, which contributed to his slow start this year (6 pts in his first 22 games, 21 pts in his final 29 games [the latter of which would put his D+2 season on par with guys like Roslovic and Fiala]). I'm amenable to moving Nylander in the right deal, but not for Braden Holtby or any other goaltender.
Botterill would never trade 7 years of team control over Nylander for two years of control over a goaltender who just put up a worse season than the goaltender we're trying to replace (Lehner).
I think the lesson might be not to trade for Robin Lehner. I'm not trying to sell you on any Caps G but to my eye the Sabres will need to do something about goaltending or they won't be "ready to compete" for a while. Going with Ullmark is reasonable but I'm guessing the Sabres will have a Plan B (that might even be a trade for a Plan A, like Holtby/Grubauer) and Lehner will be catapulted into the sun. Otherwise you're only several seasons away from being in the same position the Islanders are today with Tavares (Eichel)
I'd rather roll with Ullmark and UFA/Lehner/Cheap Trade Acquisition (e.g., Neuvirth) than trade Nylander or even the 32nd pick for two years of Holtby. We aren't a goaltender away from being good. In 2016-17, we had
two .920+ goaltenders (Lehner, Nilsson) and we didn't sniff the playoffs. We need to keep building our system, not chase after high-cost goaltenders.