Ive reached out to Michael Krumm aswell as he was quoted saying the N attack itself was possibly capable of 2 more secs hypothetical (7:06) with cleaning up a few small mistakes he made. so I would like to know his assessment of the NISMO time too with the driver plugged in.
I get that, but let me quote something from the June 2014 EVO article (bolded emphasis is mine)...
Hiroshi Tamura, chief product specialist for the GT-R, explains why they wanted to go sub-7:10 at the Ring: "To be honest another one or two seconds knocked off last year's lap time would not jump out. And even a change in wind direction can account for that difference. So we wanted to make big progress."
To me that says the regular NISMO was only bettering last years time by that one or two seconds, not hitting a time significantly better and explains why no time for the regular NISMO has surfaced yet.
I respect that Krumm thinks the car itself (the N-attack) may be capable of even a 7:06 time (which would imply the regular NISMO is theoritcally slightly faster too), BUT.. and this is the important part... The N-attack did NOT do a 7:06, it did a 7:08. Doesn't matter what the car itself it is capable of on an absolute perfect lap. What matters is what they were able to achieve with the best driver on the best run.. The same issue of EVO, Krumm mentions the 7:06 time but also says trying for that would have greatly increased the risk of botching the entire lap and not even hitting the 7:10 mark.
It's all benchracing, but you cannot even benchrace on what was not achieved, only what was. The N-attack hit 7:08 and change, that's it. If the regular NISMO did a lap faster than 7:15 (with Krumm or anyone else at the wheel), I'd be surprised considering the additional effort to attain sub-7:10. If it were 1/2 way between the standard GT-R and the N-attack NISMO, I see no reason Nissan would not be making that time public as well.