I know people like to use blocks as a defensive stat but they're actually not a great indicator for defense. Look at the NBA and most big men have their highest blocks per game in their first 2 or 3 seasons.
Saw some analysis that the high block numbers were because they were tall/athletic, but often out of correct position on defense, leaving block attemps as their last resort on shots they shouldn't have allowed. As they learn to play better positional defense, the block numbers decline.
Advanced stats bear this out as teams with high block rate players don't translate to teams with good defensive efficiency at any better rate than teams that aren't good at blocking shots.
The positioning aspect comes into play because most blocks happen on shot attempts within 6 feet of the basket. NBA teams make 61 percent of those shots. It's considered bad defense to allow them. Rudy Gobert wins DPOY awards because he's great at not allowing people to get those shots near the basket. 0 percent of shots go in that aren't taken.
Anthony Davis, Rudy Gobert, Joel Embiid, Karl Anthony Towns etc, all had their peak block per game years within their first three seasons in the league.