1:44.10 800m is good speed for the 1500m but it is not elite speed. There have been many 1500m guys who have run 1:42-43, while most years there are a number of 1:44 guys, who have included Centro, Mazano, and Engels, none of them noted as particularly fast 800m runners even relative to the 1500m.
Some of the all-time 800m guys who also ran 1500m in 3:32 or better
Coe, 1:41.73, Kaki, 1:42.23, Makhloufi, 1:42.61, Kamel (3:31), 1:42.79, Cram 1:42.88, Elliott, 1:42.97, Souleiman, 1:42.97, Timothy Cheruiyot 1:43.11, Baala, 1:43.15, Asbel Kiprop, 1:43.15, William Tanui (3:30), 1:43.30, William Chirchir (3:29.29), 1:43.33; Abdi Bile (3:30.55), 1:43.60.