Gropp had a goal and an assist in the game, with his tally coming late in the third period that got the Thunderbirds with one goal. He assisted on the game-tying goal with 2:54 remaining in regulation.
He had three straight games of a goal and an assist in the WHL Final.
The 2015 second round selection finished the WHL playoffs with seven goals and 12 assists for 19 points in 16 games. He and Seattle now advance to the 2017 Memorial Cup, where they'll face Saint John (Quebec Major Junior Hockey League), Erie (Ontario Hockey League) and the host team Windsor (OHL), which features Rangers prospect Sean Day, in a round robin tournament.
Newly signed forward Dawson Leedahl had an assist for Regina in Game 6, and finished the playoffs with 12 goals and 13 assists for 25 points in 23 contests with the Pats.
Defenseman Sergey Zborovskiy had eight assists in 23 games.
