Most likely, he is keeping private because many people want to link him in some way to a particular drug or drugs he took with Coach Salazar because they firmly believe he did since Salazar was found cheating.
There is no direct evidence that would ever show that Rupp took anything or tried to take anything.
Having said that, what you don't realize is that by losing a long -time coach, whether or not others liked him, Rupp is forced into a new normal. He has to adjust and adapt and do it on his terms.
I remember the flak that Edwin Moses got for being too quiet, but there we were, watching for another Edwin Moses win.
Maybe he doesn't want to have to answer for Alberto
Maybe he doesn't want to answer for Nike.
Maybe he doesn't want to deal with allegations anymore.
Maybe he wants to just answer for Galen Rupp.
He's been quiet all along, and yet, performing well in races.
I can guarantee he's not worrying about who wants the Bandini on him while he trains.
Godspeed, Galen