I managed to locate someone who is believed to be a descendant of Philipp Stein and has already taken a Y-DNA test. The Philipp Stein line (http://www.crewfamily.com/descendants_of_philipp_stein.htm) is one I have researched for about a year now in the belief that my Stone line may be closely related to them based on lots of circumstantial evidence I have come across. It turns out the haplogroups between us are not the same and the DNA signatures are dramatically different. As the other person rightly pointed out, while this test result certainly puts a damper on a likely connection, a final determination cannot be made until at least one more descendant can be found for comparison.
Until an additional comparison is done, we must allow for the possibility of an undocumented adoption or non paternal event in either of our lines. Another possibility, as I discovered by reading a posting on the Ancestry.com message boards (http://boards.ancestrylibrary.com/localities.northam.usa.states.westvirginia.counties.pendleton/1870.2/mb.ashx), is that there were at least two different men named Henry Stone/Johann Heinrich Stein who lived in a similar area during roughly the same timeframe. One married Juliana Andre while the other married Susannah Zorn/Zornes (possible maiden name of Ruhlman).
Therefore, I’m continuing to seek DNA test candidates from either of the Stein lines as well as from my Stone line.