Clemente is, hands-down, the #1 player in Pirate history. Prototypical "5 tool player".
Honus Wagner was kinda' like Tony Gwynn. Yeah, he could be #2. He's the main statue at PNC Park with good reason.
Stargell has numbers, but he had some flaws. One of top 5 players of the 70's, though. Would still take McCutcheon over him. I feel like McCutchen's Pirate career is what Dave Parker's could've been, had Parker not been injured or sniffing cocaine, circa 1981.
Maz was an outstanding fielder, consistent player and a great 2B for his era. When you compare Mazeroski's career and stats to any other 2B, it's not apples-to-apples. Pirates fans have no problem with his HOF nod, but not everybody is sold on him. Of course, Yankees fans hear his name a lot
McCutchen's Pirate career was longer than Kiner's. Yet Kiner was hitting 50 HR's before it became common. He also played on a lot of dogshit teams, so he wasn't the focal point of a team like Clemente or McCutchen were.