I mean Josh only played for 2 years(was injured and had a red shirt year) and didn't break any records, his technical list of accomplishments at Wyoming I think are got to MWC Championship game and was Drafted 7th overall. I don't know Josh is great obviously but it'd feel like retiring a number because he was there not because of what he did there.
Basically the QB or two before Josh with the previous HC at Wyoming actually broke a bunch of records, guy actually set the MWC most yards in a single game record with 640. 🤷♂️