I reckon Hoy would be a good time triallist.
Based on what?
I'd be surprised if he can do a sub 24 minute 10 mile, even with all the gear.
Have you ever seen sprinters training? A 1 hour training session on the track is made out of a lot of chatting and banter in between a number of savage short efforts... 2-3 laps, then back to laughing and banter...
Incidentally, it is the same as track and field sprinters... a lot of laughing and joking around, followed by a small number of short violent bursts...
Basically, it is the exact opposite of what makes for good time trialling... and that is even before we look at the numbers... I am pretty sure Hoy's VO2 max is similar to that of an average club rider. Time trialling is pretty much all down to having a huge VO2 max, same as rowing, cross country skiing etc...
That doesn't mean that if you train on a Concept 2 you will do a sub 20 minute 10 mile TT