Taiko probably attempted the royal blue color and determined that it looked bad, however visually accurate a color may be, if in pixel form it looks bad, then it looks bad.
Taiko does things his way, and that's great. If Taiko feels the metalic blue brings the detail out better, then so what. Is it really so hard to agree to disagree and leave it like that.
The suit is great, tone may be off slightly, but that doesn't mean the suit isn't great. Taiko's taken his own time to do this, arguing with him serves no real purpose, other than to retard the posting of others like Gills, and Another Agito.
Taiko could of stopped after a couple people wouldn't drop the "Are you going to do...." "Since the Missing Ace riders appeared in Decade, you should make them." and stuff like that.
I personally feel that Taiko's choice in color really makes the suit "pop" I could see why going with royal blue may of over powered the silver, and made the suit look odd.