His technique was considered a strength by draft analysts before Rhule drafted him.
The phrases you will keep seeing under strength are “fundamentally sound” “High Football IQ” in which they brag on his techniques. His weaknesses were athleticism and competition at BYU. These guys do this for a living, but you played ball back in 1952 for some small town High School so you know better right?
So yeah moving him all over the place and being a terrible developer of talent probably overwhelmed the guy where he forfeits his basic skills and tries to overcompensate. It’s like when a QB gets pressure and throws off his back foot. Does he know better? Sure, but the moment can become overwhelming and they get desperate trying to make a play (or stop a sack).
No matter how you look at it, it still falls back on Rhule. He scouted, evaluated, drafted, coached and developed BC.