In this case Axelrod is correct.
There is no good reason to name anyone at this time. It’s not going to sway the electorate in your direction. Trump is going to have to earn their trust, which he has been doing.
Just line them all up to speak at the convention and let the MSM guess Hint that any one of speakers MIGHT hold an office in his administration and wait. Everyone will be discussing it for weeks ! All will be asked to be on the Sunday talk shows etc. etc