As you say there are only a few RoLs clasps to the 7th DG. There are more Elandslaagte and DoLs combinations for men who served in the 5th DG. There is no indication on the roll to explain the RoL clasps.
Egypt (1) Gemaizah 1888 (5138. L/Corpl. L. A. Taylor. Med: Staff Corps.);
QSA (1) (4217. Sjt. Tr. L. A. Taylor. 7/D.G.);
Army LS&GC VR 3rd issue, small letter reverse (4217. S:M: Tailor, L. A. Taylor. 7/D’gn G’ds.);
Khedive’s Star, undated, unnamed as issued
Lewis Alexander Taylor was born in Gibraltar in 1865 and attested for the 68th Brigade at Limerick in 28 April 1880, a tailor by trade. Posted to the Medical Staff Corps, he served with them in Egypt, and was promoted Corporal on 26 January 1889, before transferring to the York and Lancaster Regiment with the rank of Sergeant Master Tailor on 13 January 1892, and then transferred with the same rank to the 7th Dragoon Guards on 4 April 1897.
He served with the 7th Dragoon Guards in South Africa during the Boer War, before being invalided back to England in February 1900, and was discharged at Shorncliffe on 27 April 1902, after 22 years’ service.