The most overrated guy in Hartford is Ryan Lindgren. There is a general perception that he's an inch away from the NHL, Hartford's best defenseman who's ready for a chance in the NHL. That is wrong. Lindgren is probably the worst of Hartford's 6 regular defensemen (Bigras, Hajek, Gilmour, O'Gara, Crawley being the other 5). That doesn't mean that he's bad player or a bad prospect. Hartford has a strong blue line and all 6 regular could play in the top 4 in the AHL. But if he gets called up to the NHL at any point soon, it will be only because the Rangers want to give him a chance to find out what it takes to play in the NHL. He'd never get called up in the 2019 calendar year to a playoff team that actually needs the points more than to develop the future.
Lindgren is a good skater for a defensive guy, solid speed, good edgework. Not a speedster, but good enough. Keeps all his plays very simple, which is what draws comparisons to Mike Sauer. But let's keep in mind that Sauer didn't make the NHL until he was 23. Sure, his injuries didn't help, but Sauer was in no way ready at 20, and neither is Lindgren now. I'd also say that Sauer was a better prospect at the same age than Lindgren today. While he is perceived as a defensive specialist, he still allows AHL forwards to occasionally blow past him. I am not saying we shouldn't follow him as a legit prospect, but he's not on par with Hajek, not even close. I mean, sure, if Hajek stops developing at 21 (as many do) and Lindgren keeps taking big steps forward until he's 26 (as some do), Lindgren could turn out to be a massively better player eventually. That said, based on where they are today (they are only a week apart age-wise), Hajek is a much better player/prospect.
The player Lindgren should be compared to in terms of who's the better prospect is Brandon Crawley. For some reason, Lindgren is viewed as an amazing find, while Craw is, at best, an afterthought. Between the two, Crawley is a slightly better player, but Lindgren is a year younger, almost to a day, so in my mind they're roughly equivalent prospects at this point. Both get PK time, both are generally solid defensively, but Crawley is a bit more mobile and confident (thanks at least in part to having an extra year in the AHL under his belt). That said, his points are mostly a matter of luck. He's not a driver of anything offensively or even a transitional mid-ice player. He's a defensive player who occasionally can skate up with the puck, and sometimes that results in passing the puck to a more creative player who makes a goal happen, so Craw gets his occasional point. Craw played with Hajek a bit in December, but they had to split up so Hajek could play with Gilmour to settle down the ice. Craw isn't close to the NHL. He, as Lindgren, can get very sheltered few minutes with very simple assignments just to show him what the NHL looks like, but he's not sticking in the NHL in the near future.
Frankly, I doubt we'll see both Crawley and Lindgren make it - I'd be happy if one of them turned into a solid third pair defenseman, but who knows how their development curve turns out.