The third name could be that of 1817/200217 Lance Serjeant Arthur Whorton, 7th Bn Worcestershire Regiment, a brass worker from Dudley, son of John Thomas and Harriet Whorton of Kates Hill, Dudley. He served throught the war with 7th Bn in France and Italy, and was discharged in March 1919, but reenlisted for 4 years in March 1920, serving as full Serjeant 5243665.
His Medal Index Card (which shows his final rank as Corporal; L/Sjt was an appointment, not a rank) and his service record (one batch for wartime, another for post-war) are on Ancestry. In the wartime records, there are several pages before the one Ancestry takes you to, so you'll have to work backwards as well as forwards! Image #662 (a medical form dated Italy 29/12/18) is the first.
Adrian