For sure, whoever they try might falter. Doesn't mean they can't try someone else. That's how Neris got the job in the first place. I think they should just quit saying one thing (we're gonna use the bullpen unconventionally) and doing another (conventional usage).
Garcia has also closed in the minors. Less success in limited major league action but pitching should be pitching, and he's pitching well. Of course he also has a blown save and a loss against 7 holds; if he was the closer we'd remember those two blemishes.
Last night was about as tough and high-leverage a situation as there is. One run lead, 4-5-6 batters. If it hadn't come on the heels of last weekend's fiasco it wouldn't be as notable. He doesn't have to be clean but he can't also be hittable, especially home .