Board Thread:Speculation House/@comment-25045079-20140815003931/@comment-24994749-20140816132814

I an analisys of Sun's semblance in Tumblr that explained it pretty well in my opinion, here it is:

Basically, the difference between his "light" clones and Blake's "shadow" clones is that Blake's are more like demi-solid after images she can use as shield or to step on, while Sun's seen to be made out of energy (judging by the kind of electric explosion they made when they were destroyed) and can be controlled to project different attack strategies.