How'd he make the majors?
Looking over my index card for Blaine Thomas, I have to assume that a promising pitching career was cut short by injury or illness.
Nicknamed "Smoke," (sometimes called "Baldy") Thomas was a California native, born in 1888. At the age of about 23 he made his professional debut in 1911 with the Victoria Bees of the Class B Northwestern League. He had a 7-11 won-loss record, but somehow earned a trial with the Boston Red Sox, making his big league debut on Aug. 25.
Thomas had two starts with the Red Sox, but pitched only 4.2 innings, giving up three hits, two runs and walking seven batters. His official ML record is 0-0 with an ERA of 0.00, because the two runs he allowed were unearned.
It looks like Thomas returned to the West Coast as Vancouver (NWL) property for 1912, though he never pitched for them in an official game. He went to Sacramento in the Pacific Coast League in mid-season. He got one start with the Sacts, pitching a complete game loss, giving up 12 hits, five runs and three walks.
There's no record of Thomas in the pros after 1912, and he died young, on Aug. 21, 1915 at 27 years of age.