Here are a couple of links that have been posted here before, but are relevant to the discussion and should be presented again:
First, Grappe’s 2013 study of Froome, based on SRM data:
http://www.fredericgrappe.com/?p=1322
Some key points:
1) Based on power data, he concluded Froome’s V02max was at least 85, and possibly as high as 90. Without knowing LT or efficiency, this is guessing, but one assumes that he was using relatively high values of these parameters, or else the V02max would have to be even higher. Recall that in his interview with Kimmage last year, Froome alluded to a value of around 85. There would also have to be corrections for the effect of altitude on V02max.
2) Grappe claimed that Froome’s power-time curve was normal, in that he lost 60 watts, or about 0.88 watts/kg, going from 20 min. to 60 min. This is relevant to extrapolating from today’s climb to Tucker’s line in the sand, as I will discuss in a moment.
3) He claimed Froome’s weight was constant within a narrow range, 68 kg. +/- less than 1 kg.
Second, a study of several GC riders, including Froome and Contador. Most of the power estimates were based on climbing times:
http://www.fietsica.be/Grand_Tour_Champions.pdf
1) The author estimates Froome’s Ventoux climb as 5.70 watts/kg, which is consistent with the 388 watts in the hacked data, assuming a weight of 68 kg., which is what Grappe provides. I now see why Tucker thought this was an important confirmation of the VAM estimate. Based on the usual power-time curves—and now recall Grappe said Froome was normal in this regard—the Ventoux climb corresponds to a 30 min climb with a power of 6.0-6.1 watts/kg. This is right on the cusp of Tucker’s current line in the sand, though below the 6.2 watts/kg he argued two years ago.
2) The author claims that Froome’s times for six finishing climbs of TDF 2012 and 2013 fall on a straight line in a log plot, with Toussuire and ADH both at about 5.75 watts/kg, and Semnoz about 6.0 watts/kg. These data support Grappe’s conclusion that Froome has a normal power-time curve, and again, just about fall within Tucker’s line in the sand. E.g., Semnoz was about 30 min, and was done at an estimated 6.0 watts/kg.
3) However, today’s climb was about the same length as Alpe and Toussuire, yet by VAM he was at about 6.1 watts/kg, and from Gesink’s SRM data, it seems he might have been even higher, 6.3 watts/kg.
So he appears to be at a higher level than 2012/2013, and certainly beyond not only Tucker’s current line, but his earlier line of 6.2 watts/kg. That is, if we assume the 6.1 watts/kg is correct for the 40+ minute climb, this would correspond to 6.3-6.4 watts/kg for a 30 minute climb. And if we assume that 6.3 watts is really the correct power, this corresponds to 6.5-6.6 watts per 30 minutes.
This latter value (which I incline towards, because Gesink's SRM data should be more accurate than VAM estimates) is clearly well beyond Tucker’s view of the line, and I think very difficult for anyone to defend. If Froome is really clean, either he has an extraordinarily high V02max, in the 90s as Greg's was reported to be, and/or an exceptionally high efficiency, in the mid or even upper 20s as has been reported in a few studies with unidentified riders. If he's really intending to explain everything after the Tour, he need to provide values for all three of these parameters. But that will still leave unexplained the big jump in performance in 2011.