Phili has back to back games next week against Boston and hopefully they fall to them & finally become sellers. Leafs then could make a move for Laughton & Vatanen retained (Vatanen retained twice). I know Vatanen isn't the big heavy defenseman you'd want the Leafs to add for a playoff push, he's the opposite of Oleksiak physically, but he is a very good defenseman that's available & likely has trade value at an all time low; he can also play both left and right side which is uncommon for a RHD, and has experience playing top 4 20+ minutes for almost his entire career. He could come in as an immediate upgrade to Dermott & is another PP & PK option, better shot than Brodie & Rielly from the point. Laughton too can play all 3 forwards positions.
Neither should be too costly. Hyman sticks with HEM line but still gets played extra wherever Keefe needs him.
Laughton - Matthews - Marner
Galchenyuk - Tavares - Nylander
Mikheyev - Engvall - Hyman
Simmonds - Kerfoot - Spezza
Thornton
Rielly - Brodie
Muzzin - Holl
Vatanen - Bogosian
Dermott
Campbell
Andersen
Edit: same team another D with a lower cap hit is Kulikov, he too can play both sides & has lots of top 4 20+ minutes experience. They could potentially fit Laughton (@50%), Kulikov (@25%), & Dreidger (@50%) too if they wanted some goalie insurance; he'd be a possible tandem partner to Campbell next season as well if they were to resign him.