Too, the Gardner listing (Volume 6) starts on page 258 with Aaron and ends with William on page 282 (not counting other spellings, such as Gardiner). Then, one has to wonder which of these are descendants of Thomas and Margaret (finding out can be put on the task list; the thing would be to start with those that Dr. Frank identified).
I got to MS&S as I was looking for patriots who were identified in a tree but did not appear in the D.A.R. database (see below). D.A.R. adds patriots when a new application proves the pedigree and provides the service record. D.A.R. suggests that people who were born between 1710 and 1765, as a rule, might be eligible as patriots if they meet the requirements.
Given someone born mid-1900, that would be 8 to 9 generations back. Given that women can be patriots, too, there could be 256+ people on that person's tree who are possible D.A.R. patriots. Of course, various factors reduce that number to something like 30, or so, for the max (assuming that you can prove the lineage and afford the genealogical fees). The number is large enough to keep on busy for awhile (lifetime?).
The D.A.R. effort at a database is nice in that it will provide proven lines and allow future researchers to do tree matches to fill in holes. The DB is available for search by the public at the following link.
Searching with "Gardner" for 'Ancestor Last Name' brings up 162 hits. That's a good number as there are about 7 or so people per page, for 24 pages. Does that indicate that the Gardner descendants have been fairly active in applying to D.A.R., as a whole?
Index to on-line volumes (thanks to archive.org - seventeen volumes)
Massachusetts Soldiers and Sailors in the War of the Revolution
v1 (A - Ber), v2 (Bes - Byx), v3 (C - Cor), v4 (Cos - Dry), v5 (Du - Foy),
v6 (Fr - Gy), v7 (Ha - Hix), v8 (Hm - Jy), v9 (Ka - Lsu), v10 (Lua - Mop),
v11 (Mor - Paz), v12 (Pea - Raz), v13 (Rea - Sey), v14 (Sha - Sth),
v15 (Sti - Toz), v16 (Tra - Whe), v17 (Whi - Z)
06/05/2018 -- Referenced in Gardner's Beacon, Vol. VIII, No. 1 (June 2018).