One of the reasons KR was brought in was his excellent track record of developing young players. He has, I think we can all agree, continued that legacy at Oxford thus far. He seems very good at reading a player's mentality. Perhaps Agyei is a naturally not particularly confident bloke, and so pinning the label of 'season saviour' on him and having him start every game would potentially destroy his confidence. Literally none of us know. We're all football FANS, which means we look for immediate gratification and success. KR is a manager and a developer of talent, which means that where we're looking at the individual match, he's looking at the long term benefit to the player. I genuinely have faith that he knows what he's doing with Agyei.
That said, as I said above, he's increasingly looking more and more the part, and I would love to see him included more frequently. I just don't think intimating that KR has some prejudiced agenda against him is at all helpful.