The Boston Celtics have been missing something on the offensive end of the floor, and in case you’ve been wondering what that something is, Kelly Olynyk showed everyone Wednesday night. Olynyk returned to TD Garden for the first time since signing with the Miami Heat in the offseason, and the former Celtic poured in a career-high 32 points on 12 of 15 shooting, while shooting 6-for-8 from the 3-point line in a 90-89 Miami victory. This isn’t to say that Boston should have inked Olynyk to a contract similar to the four-year, $50 million deal the Heat signed him to, but the C’s are lacking significant pop off the bench. Take Wednesday’s second quarter for example. Without Marcus Morris, who has missed the last six games with a knee injury, Boston opened the second frame shooting 3-for-9 from the field, which allowed the undermanned Heat to steady themselves after a rough first quarter and stay within reach of the C’s.