This gives the Leafs the ability to deploy 3 sets of evenly LHD/RHD pairs that can each play 20 min each. Ideally, it would be nice if the Leafs had a guy like Seth Jones (Leafs were too stupid to acquire him) or some other minute munching top pair D. But unfortunately, those guys are A) not available and B) not within the budget.
However, they could grab Aaron Ekblad as a UFA. If Rielly was moved for picks or prospects, that cash could go straight to Ekblad and solidify the right side of the defense. Leafs need to dispose of both Marner and Rielly. Replace with picks to restock the cupboard. Brock Boeser, and Nikolaj Ehlers could be had for the price of Marner’s contract. You solidify the top 6 and the defense is stronger. Is it enough to win the Atlantic? Maybe. Some time soon, the drain of talent from Florida will finally take them out. Leafs have 2 years to get it done, before the younger teams like Ottawa, Montreal, and Detroit come knocking.