just let it grow into a jumbo size. you'll see that the blue color will become more bluer. that koi may not be as spectacular as the big 3, but when u mix that koi with the big 3, thats the time you will appreciate the beauty and be glad that you keep a blue koi together with your kois in your pond.
btw, i named this koi a ginrin asagi, coz i see diamond like scales and the blue color scales that resembles asagi. for me, this koi may be a cross between asagi and ginrin or metallic koi. just my own opinion. :-)
ps. i like ur blue koi. ;-)