I'd imagine LDBB would be of definite interest to the Flames, as part of a bigger package. The Blue Jackets are just a logjam up the middle if Monahan and Jenner are healthy. LDBB showed a lot of promise in his NHL stint last year (8 points in 15 games at nearly 14 minutes and was awesome in the AHL so no fluke in his progression) and has real deal playmaking upside at the next level. Just think he's in a rough spot to really shine in Columbus.
With Kadri and Backlund aging, Zary playing wing and Frost not exactly taking the next step - I think he could compete for real minutes in Calgary as soon as this fall. A lot of the best Calgary prospects are more natural at wing - Stromgren, Honzek, Suniev, Gridin, Battaglia, Basha, etc.
LDBB and the #20 as a starting point? That's kind of the "Hanifin+" return - a first plus something a lot better than Miromanov and a 3rd. Columbus keeps their own first this year and can roll Werenski-Fabbro and Mateychuk-Andersson with Severson as depth or a trade piece.