Good question. But, conventional wisdom is don’t start a SOBO until early July. So, that’s more than a one month delay to your start.
Second, for many thru-hikers, the people are the best part of their thru-hike experience. Part of this is traveling with a community of other hikers. I suspect that there is not enough mass going SOBO to get the same feeling.
Third, Katahdin is a kick a$$ goal that builds all the way through Maine. If people were #1 with me, the goal of Katahdin would be #2. It would be anti-climatic to hike away from Katahdin. And it’s certainly not as climatic to finish the trail anywhere else, including Springer.
Peaks