Why are you surprised? last year was a break thorough performance already, even with Klay Thompson back in the team, he still perform way above, he even beat Steph in FT percentage this year.
And yes, if he remains consistent this year, him and Wiggins will fight it out to be included in All Star. Wiggins got his first last year and then others question it. But he proved his critics wrong in the playoffs with huge game. We might see that to Poole this year.
Poole is a good player, and I don't deny that. But I believe his style of play is different from an AllStar. Poole is very consistent and when his teammates needed his help, he was there to help.
I don't know if he is a player with a lot of impact on the team (not collectively but individually speaking).
I analyzed some of his statistics and found the one of his main attributes is in fact his consistency, a technical feature rare to find in some players these days