The bottom line is that as the L, you initiated a rotation that the the T did not pick up on. He should had become the new L, but since he didn't, the C kept moving to pick up the end line....He recognized what was going on. At least you weren't in the "I" formation.
In your case, as soon as you crossed mid-court and realized your R wasn't gonna budge, you could moved laterally to the T position on the opposite side....It may be ugly, but at least you would've had proper coverage....
No one would notice this except an official. These things happen....But hopefully only rarely.