We will see. The talk of injuries needs to be eased down though. Teams who have let in less goals have also had serious injury problems on their defensive side of the game and still maintained it.
Where I see an issue is the Lightning have let in 4+ goals in over 11 games. So in even more than 1 in every 4 games they let 4 or more goals in.
It was a mixture of injuries and coaching. With McDonagh, more than the injury, I think it was a new system and a hectic schedule, so he didn't gel right away. It's pretty common with rental defensemen. I don't even know if rental defensemen are a good idea in general anymore. Anyway, what's clear is we didn't have anything close to the current version of McDonagh in our line-up last year. And Rick Bowness, our D coach, has been fired and replaced by Todd Richards, who corrected our offense/PP previously, and now is correcting our D/PK.
As for those 4+ goal games, you have to keep in mind Vasilevskiy was injured for 16(?) games, and Louis Domingue was a hot mess for about a 6 game stretch, despite getting wins. One of those games we played Eddie Pasquale in what will likely be his only ever NHL start. I think it's actually a testament to how good the team is playing that we got through that stretch above .500, let alone in 1st place. I don't think anybody believes we can go deep if Vasy gets hurt, but if you count the games where Vasy gave up 4 goals, you're gonna get a much smaller number.
But the one thing nobody is talking about when comparing the current Lightning team to the teams we saw in the last several years is: Steven Stamkos. He's back. People can say what they want about his 86 points last year, but it was NOT a good year for him over all, and he looked like a 60 point player who happened to have the best winger in the game next to him. This year, Steven Stamkos is legit back. And I've been one of his biggest critics on this site for years. But it's like he's given up on being a two-way playmaker, and is now just back to shooting the puck, while playing a solid, responsible game, which ironically even makes him a better playmaker (because he doesn't telegraph passes anymore). He looks like a monster right now. This is a weapon we HAVE NOT HAD since 2013. I can't stress that enough.