To generate 9.7s for men and 10.7s for women 200m requires a certain amount of power output over the required duration.
BC elite team marginal gains in other areas, such as bike stiffness, aerodynamics, technology, and any other variable, has not been objectively quantified to the general public, that I am aware.
BC have improved training methods and medical back up, that has improved recovery, well being physically and psycologically. BC elite program has not quantified the total amount of improvement this has made.
BC said improvements are down to marginal gains, which may seem reasonable on face value. The marginal gains have not been quantified to the general public objectively, so cannot be certain whether this has totally accounted for (one whole second in the 200m tt from amateur to elite) and whether this explains the extra power that has materialsed.
My point of comparison was that in 1997 the men's National record was a touch under 10.7 sec and we can consider that this was an amateur era in British track cycling. Yes, there may have been drugs in that era, as proven by one sprinter being caught. British track cycling now is an elite system. The men's 200m National record is now 9.7s. So we have a benchmark of one whole second. This benchmark is further objectified as the amateur record in 1997 was done on a new state of the art indoor wooden 250m velodrome, with double discs used.
I hope I make my point here clearly, where I ask for the 'gains' to objectively add up and to totally explain the improvements. If they do not then I remain sceptical.