UCLA received a double dose of welcome news Tuesday regarding the NBA draft: Thomas Welsh and Aaron Holiday are withdrawing their names from consideration. Welsh announced on Twitter that he would return for his senior season and Holiday’s mother, Toya, said in a text message to The Times that her son would come back for his junior season. Welsh’s return means that the Bruins will not have to replace their entire starting lineup after freshmen Lonzo Ball and TJ Leaf declared for the draft and seniors Bryce Alford and Isaac Hamilton exhausted their eligibility. “I’m extremely grateful for everyone who helped me through this process,” Welsh wrote on Twitter, “and I can’t wait to get to work for this upcoming season.” Welsh and Holiday will give UCLA a much-needed veteran presence to complement a six-man freshman class that has been ranked No. 2 in the country. The Bruins also remain in the running for guard M.J. Walker, a McDonald’s All-American who is expected to announce his college decision Wednesday.