Not all NOBOs are reliable sources of information. If you were to read Baxter State Park's
camping page or call them, they might be able to straighten you out.
Were you to search WhiteBlaze's postings, you would eventually find most SOBOs begin at Katahdin Stream Campground, summit Katahdin via the AT (Hunt Trail) without a full pack and return to KSC by the same route, where they happily call it a day and spend a second night.
An alternative strategy might be waiting at Togue Pond gate until it opens, ascending Abol Trail and descending Katahdin SOBO. Some AT hikers think Baxter Peak should be summitted, rather than descended. Either way, what goes up must come down and you should be more concerned with what
you think.
While a night at Chimney Pond followed by an ascent of Pamola via Dudley Trail and crossing Katahdin's Knife Edge might be a desirable start, such a hike involves arranging to have one's pack shuttled to KSC or carrying one's full pack which might not be a problem if it's a relatively light, internal-framed pack, one's fit and the weather cooperates.