I get that Danny is into collecting assets, but trading for Lowry wouldn't make much sense unless the plan is to trade Rondo.
Lowry costs too much to be a backup; won't be able to get return on the investment unless he's starting.
I don't know that Lowry makes sense even if you do trade Rondo. Isn't he a FA this offseason? The two questions I'd have are how much (and for how long) you'd pay him and how long would it take for you to regret that contract?
I'm with you; I don't really see the point in trading for Lowry since we'd have to give him a contract. I think he's on the same level as guys like Felton, Chalmers, Dragic, Teague, Hill etc -- if you have a talented roster otherwise and you don't have to overpay for him to be your starter, that's solid. Any of those guys, including Lowry, can have stretches where they play really well, too.
I don't see how Lowry could be a buy-low / sell-high guy (as Asik might have been), so unless there's some corresponding move to add a lot of talent elsewhere, I'm confused by this supposed interest.