It is always tough to get an adequate return when a franchise trades one of the top players in the league, like when the Buffalo Sabres traded Jack Eichel. At the time, because of the things surrounding the situation, the Sabres had to do and found a trading partner in the Vegas Golden Knights.
The Golden Knights and Eichel have gone on to have plenty of success, while the Sabres have continued to struggle. However, the return the Sabres got hasn't been part of the problem, and one player in particular has developed into one of their top players.