You do, in my opinion, the mistake to look at PB of the athletes without looking, or knowing, at their characteristics.
Daniel Komen was absolutely able running very fast alone. I can almost say he was disturbed by his rabbits, since never ran so fast when his pacers went too ahead in the competition.
I had Shaheen, for example, who in 2006 had the potential for running 7'20" in 3000m and under 7'50" in steeple, but he never was a guy able running alone. He was a "killer" of the other competitors, Daniel Komen was a "killer" of the time.
Also, don't look at PB of this athletes like their "real" record. If Mo didn't run in Monaco, his PB could still be 3'33"98, and all this discussione couldn't happen.
Komen could run well under 3'30" when at the top of his shape, and could run well under 27', but never had, of tried to have, the opportunity for running at his best event different from 3000 and 5000m.
Athletics at top level is also a problem of money, and the appearances (which several years ago were very high) obliged top athletes to repeat always their best event.
For giving an idea, Shaheen could have 60,000 USD for starting 3000 steeple for trying WR, and in the same meeting no more than 2,000 if wanted running 5000m. So, you can see something strange : his PB in 5000m is from 2003, beating El Guerrouj with 12'48", when his value was by far not the same of the period 2005-2006, when he could run very close the WR of Bekele.
Don't think the real value of Mo is 12'53". He ran already 12'57" in 2010, when we worked together for some month in Iten, in Zurich, and now is very much stronger, after going to Salazar. To think can run near 12'40" is something reasonable, such as the possibility of running under 26'30" in 10000m.
But 7'20", in my opinion, is the strongest record in middle distances. I don't know about the calculator of Ventolin, and normally I don't like to think at what athletes could do in the past, because I live in the present thinking of the future. But, because we speak about the Future of Mo, and not the past, I think the evaluation of Ventolin can be really interesting, also because Mo is, after Gebrselassie, the only athlete having a range so wide IN THE SAME PERIOD.
Haile ran 3'31" winning World Indoor Ch when was WR holder of 5000 and 10000m, only after many years moved to marathon.
Kenenisa could be the same : he ran only once 1500m at the end of a season, without too much shape and motivation, in 3'32"35, and coul run around 3'30" at the peak of his shape in the right period. However, they tried several times to face Komen's record, and never were able running very close 7'20". The same El Guerrouj.
One my doubt is Mo has still to show his ability in running alone, against the watch and not against other competitors.
And, when you look at a record, of course you have to run great part of the race alone.
Personally, I don't think he can try any record BEFORE Moscow. May be can try something after, but, in the case of winning both the titles, he can go out of WCh nervously empty, and for trying a record you need to be at the top of your nervous energies.
If Mo wants to try some record (specifically 10000m), the right season is the next. To prepare a full marathon for April doesn't mean is not possible to be at the top for 10000m at the end of August. It depends on his motivation, and on the choices of Salazar lookin at Rio 2016.