Why? Gunnar was a good skater, a good outlet passer, while playing a cerebral game and taking on tough defensive assignments (like he has at the WJC) and could PK. Similar frame as Lindstein. And not known as a two-way powerhouse though could contribute offensively. I could easily see that as how Lindstein games translates to the NHL level. And there’s nothing wrong with that.
Gunnar was taller, Lindstein is a much better skater and passer IMO. Gunnar was never someone that could QB a PP, while it's not Lindstein's main strength, his passing ability, skating ability, and IQ allows him to at least be capable of it.
The things that I see that will prevent Lindstein from succeeding come down to his size/strength will he be able to make his weakness an area that can't be exploited at the next level, and then his skating and decision-making/transition, can his stength maintain a strength at the next level.
Gunnar was someone that played a decent enough robin role to Petro and Phaneuf in Toronto.
Even of recent Blues players, Leddy is a better stylistic fit than Gunnar.