Shawn, you seem to have left out in previous descriptions the canted queens, I may have missed it though. Are the rafters one piece or two, breaking on the purlin? At only 24' I am guessing full length. They are reduced at the purlin. If there is a break/segmented rafter has the rafter pulled apart at the break, right over the purlin? Just something that may be noteworthy.
The queen system should be assisting with holding back the thrust of the rafters, there is the strut backing the queen post up, but if the ends of the ties are compromised, like the one in the bottom picture, the strut has no base and I can see it drifting. How many ties have rotted, just the one? Do the others show withdrawal of the tenon, other than the one with the missing pegs? It would be my suspicion that the repair of 20 years ago only sured up the building, leaving it distorted, did they correct the foundation in a way that brought the building true again? Check all the lower wall girts to see that they are all in the same plane, a bench mark, using a water level or laser transit.
Once back together that corner post with the missing pegs, begs for 3 new pegs.
Tim
