Rielly was drafted in 2012, spent one season in the minors, then was a full time NHL player.
Development is different for every single prospect, but I don’t think it’s unreasonable to suggest at least one of the two young defensemen could play meaningful minutes next season, especially considering both have logged considerable pro level minutes, something that’s Rielly did not prior to joining the Leafs.
I like Bob, but I don’t find his perspective the most powerful.
Also, outside of Lil and Sandin, we have other D who definitely could push for a spot.