This is a very solid analysis. Thank you. I agree adding Tavares is ultimately adding a net positive to the top six. If that is the plan, perhaps their need for legitimate F replacements isn't as dire in the short term.
So if the Leafs' long-term plan is to load up the top two lines, my question is if they feel they have the defensive depth to prevent goals at a reasonable enough rate. How confident are they that they can build a top six D unit capable of being competitive in the next few seasons? Factor in the likelihood that they may be hard-pressed to re-sign Jake Gardiner next summer.
I think the reality is that the Leafs weakness is going to be their D group. There is no perfect team in the NHL. They will never be able to build a D that matches up well against Nashville's D, just as Nashville wouldn't be able to build a forward group that matches up well against Toronto's forwards.
I think it comes down to mitigation. The Leafs will likely prioritize D who do a decent job of neutral zone D, move the puck out of their own zone well, and help gain the blueline with control. This will just decrease the amount of time there is pressure on their greatest weakness. If Toronto can do this while also creating a good special teams advantage, they have a team that can exert their advantages over another team in any 7 game series. It doesn't guarantee a win, because chances are if they want to win, they will face teams who will be doing the opposite, and trying to exert their advantage on the blueline over the Leafs.
The good news for the Leafs is that generally, top end offensive talent is hard to get without top 10 picks. So having that part of your team in place when you start being a perennial playoff team is an advantage. Underrated D get let go, fall in the draft, and come out of nowhere way more often than forwards. So while the Leafs aren't likely to build a stellar D, there is probably a better chance to improve that area of your team without top picks than it is to grab a #1 center without one. Also, the type of D the leafs will priortize, will likely get undervalued a lot. Think similar to the Vegas D, in the sense that they were all guys other teams were willing to give up on, but as a whole were actually pretty good. Not saying the Leafs will find 6 guys, but with Rielly and Dermott under control, they already have some talent to go with a couple of recent first round D picks. So adding one or two underrated top 4 guys to that group, or finding one your own organization previously underrated, will have a pretty big impact, even if they lose Gardiner. Again, that won't make it a strenght, but if you get 4 guys capable of moving the puck well, who are all solid top 4 guys, and your team strategy is around keeping the puck in the forwards possession, you have a team that can win against anyone as long as they execute their game plan better than the opposition.
In today's NHL, I think that is the most you can ask for.