In the section where Poor Tony has his seizure, he mentions Emil is mad at him for the thing with Wo and Bobby C. Many people have hypothesized that this Emil is 'yrstruly', and the only Emil in the book is Emil Minty, who is a heroin addict, which makes sense.
The word 'yrstruly' does also crop up again in a passage with Randy Lenz, but it seems unlikely that he is the 'yrstruly' from the earlier section.
If Emil Minty is yrstruly, and Burt F. Smith is the guy they mugged and left by the dumpster, and they are both in Ennet House, shouldn't they recognize each other? Maybe Burt Smith was too drunk to remember him, and Emil probably wouldn't be the one to bring it up.