Because a healthy Varlamov is still a starting goaltender, and it's much safer to run a tandem of Varly + Grubauer with Francouz there if/when Varly goes down to injury vs going with the two new guys, who aren't proven as a starting goalie, let alone one coming from the KHL.
I'd bet this is his last season with us though, we just brought in a guy who wants to be a #1G in Grubauer, and Francouz who has the same aspirations. I love Varly, his time is almost up here but I think we're better off next season with him around for at least one more year.
Didn't mean to come across as cross, these HF servers are making posting a pain in the ass. I did originally have a longer in depth one that never got sent so I went the passive aggressive path.