I hear this often, and suspect the reason that we don't is that Potter thinks there are aspects of his game that need working on before he can make the 18 more regularly.
Perhaps and he does see him every day etc.....
But, the best test is to play at the level and work from there. The Leicester game he was fine, although he was on the right. Now we’re safe there is an opportunity to ‘blood’ a couple without weakening the team.