Soldiers Who Served with John O. Dirlam

COMMON ORIGINS?
I have copies of three muster rolls from Blakeney's Company of the Royal Welch Fusiliers. The first, dated January 8, 1777, is the earliest record of John Dirlam in America. The second, dated February 24, 1776, documents Dirlam's capture. The third is a final head count taken before the British Army's return to England in 1783. Rereading them for clues I found these Hessians "Joined 18th Oct'r, 76":

1. John Dirlam
2. George Lampman
3. Nicholas Murstedt
4. John Burchers

We know Dirlam's fate: he stayed in the US. After the surrender in 1781, the British army camped in New York until they sailed home in 1783. A final muster was made, and any man like Dirlam who was listed as captured, who had not returned to his unit, was then listed as a deserter. Our ancestor!

We also know Lampman's fate. Listed on the first roll as sick, the second roll records his death.
Murstedt is missing from the final roll, so I guess his death is probably recorded on a roll I don't have. Burchers survived and the final roll lists him "on command." So Burchers probably sailed back to Germany. 

Anyway, I wonder if research into these three names might yield clues about Dirlam's origins. My researcher for the War Department records told me that Dirlam didn't appear on the roll made at Portsmouth Harbor, when the British inventoried the Hessians before shipping them to America. But were the other three men listed there, or not? Does the record show what towns they were from?

FELLOW TRAVELERS?
The muster roll for Blakeney Company that's dated February 24th, 1778 lists Dirlam as captured, and several others also:

1. James Lowen
2. James Grime
3. Edmond Hill
4. Daniel Brylie

What became of these men? When that final muster was made in 1783, Hill was listed as sick. And Lowen, Grime and Brylie are not listed. What happened to them?

A James Grimes is listed in Canadaigua, New York on the 1800 and 1810 censuses. It's interesting, since Dirlam's son Sylvanus lived there in 1810. But the soldier Grime would have been too old. There was also a cordwainer with the same name in New York City in 1815.That's interesting since John Dirlam was a cordwainer.