Using BaseballReference.com, and using the Fielding Runs metric (where Joe Morgan was a -1, meaning he gave up one run more than the average 2B _over the course of all his games_) then these guys were better FIELDERS at 2B than Joe:
Rennie Stennett (+9, so 10 runs better than Joe)
Mike Tyson, Cardinals (+7, so 8 runs better than Joe)
Davey Lopes, Dodgers (+6, so 7 runs better)
Manny Trillo, Cubs, (+3, 4 better)
Rob Andrews, Astros (+6, 7 better)
There are a few more but those are "significantly" better. But you have to understand that it would take about 10 runs to change the outcome of 1 game, so. . .even the BEST in the league by this metric doesn't win one game all by his fielding.
Here is the link to this data:
1976 National League Standard Fielding - Baseball-Reference.com