Grebyonkin's definitely our under-the-radar (outside of these forums!), wildcard prospect. My (remote, stat-watching) view was he found an ideal loan at Amur, getting top-6 icetime on a generally poor team. Often seems to be a struggle for young Russians to get such opportunities.
This year, if he manages to hold on to regular ice-time at Metallurg... could be exciting. He is turning 21 next year, so I hope ELC discussions start soon.
Only 3 games in, but he's getting 13:05 TOI/G and 19.7 shifts/game so far, including 1:38 on the powerplay. Last year, he got 2:12 TOI/G and 3.6 shifts/game in his 8 Metallurg games (ha) vs 16:39 and 19.5 with Amur.
Side note: SDA off to a hot start back in the KHL with 2 G 2 A in 3 games. Probably fair to write him off, but could be interesting if he has a huge KHL year.