I'd even go a step farther. The short position in WU has never been large in DTC terms, not even before the crash. WU is a stock shorty ignores, and with good reason: the steady earnings, FCF profile, buyback tendencies, and low multiple of WU are all potentially ballbusting for a short. WU is a very high-risk short even if, like all stocks, it falls from time to time. Shorty doesn't need Icahn for an enemy here - WU can beat shorty on its own, with ops-generated cash.
An ideal short is a shrinking, cash-poor, high-multiple company that disdains its shareholders. There are a lot of these companies out there - they are the rule, and WU is the exception. SKUL is a great example of that kind of company, and its stock deservedly got shorted into the ground.