Dalton's season has been one of balance, and "keeping things in check." His three-week scoring bonanza came against weak defenses. His eventual regression to the mean that followed came against tougher ones. He threw three touchdowns in Week 11, but only finsihed with 93 passing yards. In his most recent game, against the Chargers, Dalton had his second game in the last four with one or fewer touchdown passes.
The Colts, meanwhile, have allowed 20 or more points to opposing quarterbacks once in their last four games, But extend that back a little, and they've done it three times in their last six. Two of those games saw a quarterback going over 30. And two of those games (two of the better ones for the Colts) were the Titans, who have the 12th-fewest passing yards this season.
So an erratic quarterback meets an erratic defense. If anyone claims they know what to expect, they're lying. Dalton's worth the gamble in 2QB leagues, but the risk is too high to start him in standard-sized leagues.
It's possible Rondo gets clearance to participate in full-contact practice at that time, which would be the next step in his recovery from a torn ACL.