You forgot Westbrook, although he might still be out into next year.
Some recover better than others from Tommy John surgery, and some come back a better pitcher.
Nevertheless, I wouldn't call starting pitching a "need" next year. There will be plenty of teams more in need than the Indians.
The rest of June will tell the tale of the rest of the season. The Tribe is fortunate enough to play some bad/mediocre teams in interleague (Padres, Giants, Rockies, Dodgers and Reds).
If they are more than 10 games out at the end of June, it may be time to put Sabathia on the trading block.
This team is close to turning it around. They just need to get the worst hitter with RISP out of the No. 5 hole, and get the best hitter with RISP out of the No. 8/9 hole.
Betancourt will turn it around. He's been solid for 5 years. Guys with that track record just don't lose it overnight.
And maybe this DL stint was what Hafner needed to turn it around. It seems to have worked for Joe Borowski.