At first this seems a bit irrational, but the more I think about it the more it makes sense.
Lets say the reports are true, and Rondo did say that he wants a $100m contract next year or he'll walk. Suddenly Boston is put in a position where making a move, if they can find a pair that suits them, makes a lot of sense.
Boston has been talking door a while now about needing a scorer. Thomas averaged 20 PPG last season on a team that also featured Rudy Gay and Demarcus Cousins. He's certainly a scorer.
So let's say Boston makes a trade of Rondo for Thomas. Danny gets his scorer and also gets younger, I imagine he saves a ton of cap space in the process as well.
The problem is that Thomas is a liability on defense. Conveniently Danny now has two backcourt players (Bradley and Smart) who's speciality is defense. This means they have the ability to ensure that anytime Isiah is on the court, there's always a defensive guard out there with him. They also sound young, who's a bigger, offensively oriented guard. This 4 man rotation goes then a ton of flexibility. Their starting lineup may be Thomas/Bradley. If they need shooting they can go Thomas/Young. If they need defense they can go Smart/Bradley. If they need size they can go Smart/Young. Ton of flexibility there, and all for guys have upside and are relatively affordable.
Now due to financial reasons, I can't imagine a straight deal of Thomas for Rondo would be possible. Boston would need to get additional assets back to match salaries. Rusty Gay + Thomas for Rondo and Green might work. Maybe it will just be Thomas and McLemore and filler for Rondo. Epithet way, we'd be getting something back.
I think I can see where Danny might be going with this.