The 25 minutes was based on the following interpretation of the question: what could Bekele or anyone possibly run if they had done little to no serious aerobic exercise in their life (no football or other sports, no formal running at school, no running or long walks to and from school, etc), but had remained active enough to stay quite healthy (not overweight for example)? I still say that sub 25 is not reasonable in that situation. As I already wrote, genetics are limited without environment, you need to stress the aerobic system when young, even if you are Bekele, and you need to be comfortable psychologically and physically (impact, etc) with a sustained effort.
As I again already wrote, if the question is instead what could Bekele run if quite fit aerobically, but had done no serious, focused running training, then obviously I agree with way below sub 20, but sub 15 is still nonsense. What you claim to be facts are not facts, they are your assertions; we do not have any evidence of such a situation. My argument, already given, is a historical one: Hägg, Zátopek, and other great runners of the past were running only just sub 14 with very hard training. There is no way anyone untrained gets within a minute of what they could achieve. It is completely fallacious to look at modern running times and draw the conclusion that today's runners are more 'talented'.
Allow me also to remark that the 80% talent notion has still not been defined in any meaningful way. If you mean the percentage of what one could ultimately achieve the first time one tries, that is the interpretation I gave it earlier, and the other poster scorned it. Personally, I think the whole notion of talent here has no substance. There are genetics, there is environment, there is luck, and there is conscious effort.
Other stories about people supposedly running fast times off no training tend not to stand up to scrutiny. E.g. there is one about Said Aoiuta supposedly running 8:15 in the 3km off only football training in 1978. On closer inspection, this appears a tall tale; he has given other versions of it (8:01 in 1977 for example), and appears to have run plenty at school (just, by his own admission, not have been especially good), as well as having been doing running training in some form since 1977.