I am not so sure he's actually a step down from Pivetta and I also think the lefty with playoff experience would not be a bad thing, including against the Braves in September, and especially if they aren't going to get a lefty reliever. But I doubt they are too serious about him - certainly not to where they'd outbid the Cubs. Given the $ involved the goal would be to steal him. "Could be" contains no reporting at all, not even a rumor. It's just based on earlier interest and the obvious fit
Maybe in a roughly equal deal the Rangers would do Cole a solid and send him home. Of course the Rangers also have any number of relievers available.
I think Klentak is doing just what he did in free agency, he is going to take what the market gives him. Even the coyness about Quinn coming up tomorrow is part of it. Is there a deal they could complete tomorrow for a bat instead? Probably. Do they have to? Nope.