I think this series is going to revolve around Kyrie/Love's defense to a large extent. That and whether Cleveland's role-playing shooters (especially J.R. and Frye) keep hitting their threes, or whether they choke on the big stage. If JR/Love/Frye/Irving (and to some degree Shump/Delly) can hit threes and Cleveland's defense isn't completely embarrassing, they can absolutely win this series.
I still have GS in 7 though. I trust GS's shooters and GS's defense a lot more than Cleveland's, even if they don't have a Lebron. And I think the digging down they had to do in the OKC series put them through the fire already, so they're more battle-tested than they ever have been.
Random out-there thought - I think Kyrie needs to play with the second unit more. Delly isn't bad with the first unit, because they don't need him to score and his defensive effort is great. Kyrie's defensive flaws are minimized when Shump is on the floor with him and Love isn't. I would play Kyrie every second of the game that Lebron isn't on the floor so that an actual creative scoring threat is on the floor at all times, and reduce Kyrie's minutes overall so that he can give full effort on both ends of the floor every minute he's on it. Then give Delly more burn with the first unit, to force GS's guards to work as hard as possible. I also think that running Kyrie with the 2nd unit would allow Lebron to rest a bit more and make him more effective for the rest of the game.
Roughly (of course everything always depends on game situations and a shytload of other stuff).
Lebron-TT-Love-JR-Kyrie: 20 minutes
Starters with Delly: 10-15 minutes
2nd-unit with Kyrie: 10 minutes
Depending on how everything's going, the rest of the minutes would be Lebron with the 2nd unit, Lebron/Kyrie with the second unit, or whatever other various combinations are working that particular game. And I'm not opposed to Frye eating up either TT's or Love's minutes depending on how he's playing. Or a magical comeback by Mosgov.