I just don't see how a great coach one position translates to another position he has never coached or been associated with. Honest question, if RB is so easy to coach, why have ours performed so poorly the past 3 years? Poor OL play? Poor play calling or just poor development. If true, was Beckton consulted about this move? You are kept on staff, after developing the best TE in the B1G and now going to coach RB's.You are making way too much about Beckton never playing or coaching that position before. RB probably requires the least amount of "coaching" of any position on the team. Now I could argue that Beckton's coaching ability might be "wasted" on RB, but he would do just fine in that job. Beckton's development of the tight ends at NU have been great under his watch, even if they have been underutilized under Frost. If Frost wants the RB's to improve, I would put my best coach in that position, and that's Beckton IMO.
A great guitar teacher is not going to make a great flute teacher. Or an airplane pilot a helicopter pilot. Or even a great english teacher translating to a great social studies teacher.
There's a saying that's relevant. Stay in your lane. Meaning go with what you know. With a complete O staff change, I would try to keep something constant. Have at least on position solidified to ensure some "continuity or operations".