For Sub-V, we often try as often as possible to rotate people so that everyone gets experience at every position. If we have 4-man, and a young Ref, we often try to have an experienced guy at U - or vice versa. But seniority absolutely does not dictate your position - and I agree with the comment that years does not equal experience.
The only exception is that 1st-year guys often spend all of the 1st half off a season on the lines, until they feel comfortable in the middle (usually dictated by when THEY pipe up and say they want to try the middle.)
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