That is not correct
Very correct. He's too slow to go by anyone or to cover anyone.
There is a really good replacement for him after this season. When the team drops JJ and Amir Johnson, they should extend Covington and sign Avery Bradley. The Sixers' biggest need is a 3&D guy who can Bruce Bowen the opposition's PG. Bradley can also cover SGs.
As great as Simmons can be, he won't be able to cover PGs. There's no sense wearing him out. Covington is a really good defender, but let's let him cover SFs like he should.