BOSTON — The Boston Celtics were down a starter Thursday night, and an unlikely source stepped in to fill the void. With Jaylen Brown (foot soreness) sidelined for the Celtics’ matchup with the Milwaukee Bucks, conventional knowledge would lead you to believe either Marcus Smart, Terry Rozier or maybe even Marcus Morris would take Brown’s spot in the starting five. But it was Semi Ojeleye who wound up getting the nod, and the second-year forward’s efforts helped lift the C’s to a 117-113 win at TD Garden. It was a tall task for Ojeleye, who’d only logged 23 total minutes through seven games entering Thursday. The Duke product didn’t have t... NESN.com