Talk:Day 161-170/@comment-26898460-20150824062651/@comment-124.83.22.177-20150824133945

I'm pretty sure it would grow the organ, though. Just like the scales. He could turn it on or off at will, and the scales would appear. I don't think there's any need to question whether or not it makes sense, as it's essentially the same thing as turning his good luck or bad luck abilities off or on. The abilities page on syosetsu says that Rou keeps them (at least the positive ones) always active by choice.

With this in mind, maybe the reason Rou hasn't fused those two abilities together is simply so he doesn't bind the Phased Radar Array skill with an ability that's bound to an organ which, if damaged while in use, may hamper the ability's usage.

Anyway, we do have examples of Rou combining abilities that grow organs (the scales ability) with a non-physical ability (his abilities which boost the strength of his body). As there has been no mention in the story of there ever being any prerequisites for combining abilities, I think it's safe to just go with what Rou said when he discovered his synthesizing ability and that he simply only wants to combine abilities when he's reasonably sure that something undoubtedly better would come out of it, as he loses the abilities used as components for the synthesis entirely.