No...
I believe that koi growth is comparable to sailing...
if you stop it takes awhile to start back up and you can never get to where you would have been if you didn't stop.
(Yes that's a little simple analogy and their are times where waiting on a differentwind direction and taking a different heading will get you there BEFORE the imaginary sailboat that never stopped.)
but then to bring up what I totally imagine based on me staring at koi and thinking and thinking what the heck is happening...
Some koi just do not grow fast in the beginning ( I call em "bottom-huggers
because they stay at the bottom of the pond..this also slows their growth..till they leave) , BUT they can takeover their faster -growing siblings in a couple of years...
it is often that THOSE koi also end up in the "too slow-growing to keep another year" tank...
So I guess the answer is "no" except in the case where the genetics of the individual koi are such that it would grow slow in the beginning and then "perhaps" grow just a sit was going to in a crowded tank, and might be able to "take-off" after being purchased and placed in an environment conducive to fast growth...so
well
"no" except...