Luke Stevenson is giving the Mariners the kind of prospect update that gets more interesting the longer you stare at it. The numbers are loud enough on their own. Seattle announced Stevenson as its April Minor League Hitter of the Month after he opened the season hitting .321 with a .500 on-base percentage, .482 slugging percentage and .982 OPS across 17 games for High-A Everett. He also scored 16 runs, doubled six times, homered once, drove in 10 runs and drew 20 walks. A catcher drawing 20 walks in 17 games is a player already forcing pitchers to come into his zone. That’s a hitter showing he doesn’t have to chase his way into production. In Stevenson’s case, that matters because he is not just another minor league bat trying to put together a loud introduction. He is a 2025 first-round pick, MLB Pipeline’s No. 8 Mariners prospect, and now one of the more intriguing early stories in Seattle’s farm system.…