Any known numbers of other riders?
FTP will be a good deal higher. Aerobic threshold is where your energy system starts to change its main fuel source from fats to sugars and is the limit of what you can sustain for extended periods of time while FTP is absolute maximum for a 1 hour effort. For a well trained athlete Aerobic threshold is about 75% of FTP.
FWIW 5.2W/Kg FTP is actually what you would expect for most U23s and Continental riders, but you wouldn't be winning unless you can sprint.
If his AeT is 320W then an FTP ~ 420W sounds about right. Kid is a beast already![]()
If all the information checks out (and i am not a specialist, just been looking stuff up, so take it with a grain of salt)... 320 being his AeT, 420 being his AnT (in 2018), which is basically the "lactate treshold". Then it bodes well for Remco, compared to Froome's lab test (if they are to be believed). Froome has a lactate treshold of 430, but also weighs 7 or 8 kgs more. That basically means at his current weight, Remco outmatches Froome's Dauphiné 2015 w/kg already (6.9w/kg vs 6.5w/kg). With Remco's FTP being 400 (95% of AnT).
To consider, his small form factor also helps his aerodynamic shape on top of that, and by losing some more weight (which he can) he will come close to Froome's VO2Max (and further widen the w/kg gap).
If i messed up, i'm sorry, feel free to educate. Not my playground.

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Other interesting tidbit:
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And according to a guy on twitter, based on the ITT over 42 minutes in California 2018, Bernal has an FTP of 367w and weighs one kg less than Remco (topping out at 6.1w/kg). Bernal supposedly does have a superior VO2Max of 91 or 92 iirc.
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