It was pointed out (in another thread) that they are the same rank. Yet, Telford tried to over-rule Young during the body-swap scene. Do you think Telford has more seniority? Telford seems to act like the whole group is supposed to be under his command despite the circumstances.
Edit:
I should add this post (from another thread):
Edit:
I should add this post (from another thread):
Both Young and Telford are full colonels, as they both have an eagle insignia on their uniforms. Young was the commander of Icarus base, and Telford was there to lead the SG team that was supposed to go through the gate when the nine-chevron address was dialed. But of course, the Lucian Alliance attacked and Telford led the 302 squadron against the death gliders.