Given the right weather conditions I predict Tadesse will destroy Geb's 2:03:59 - His 58:22 converts to low 2:03:00, and given his strength and capacity he could easily pass through half in 61: high and feel comfortable, especially in a pack with pacers, as opoposed to being on his own like in WR half.
Enjoy it will it still exists Geb, because it is going down hard and would not be surprised by a 2:02: high. That's right you heard it here first!!