Sometimes when they gobble like crazy on their way in they suddenly go silent, alot of times it's because they have a hen run in like you mentioned. If it's before 0900 there a pretty good chance that's what is happeneing or even a hundred other things, coyote ran in, bobcat was sneaking in on them, another hunter tried to cut in on your dance partner. But sometimes they gobble like crazy and then shut up, circle around and come slipping in silent, looking things over. Lots of gobblers slip in see movement or the hunter gets up and starts after them and gets busted. I have had several gobblers over the years slip in beside me or behind me. If it's after 0900-0930 there's a good chance he's still coming in, hang out a little longer.