UPL hasn't proven anything at the AHL or NHL level. He's not going to net more than a 3rd. Hence why it just makes more sense to keep him and hope he pans out

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https://www.nhl.com/sabres/news/buffalo-sabres-ukko-pekka-luukkonen-nhl-rookie-of-the-month/c-340643276

A streak of 9 games in a month where he won 6 of the starts only proves he had a good stretch of games, which nearly every goalie to ever play in the NHL will have. To be worth a 2nd and 3rd as a goalie you'd have to have shown consistently that you are a tandem goalie. He has not done that.