It is Hiro. M's work. Theres no reason to believe otherwise until either he says so or someone else comes forward to claim their credit. Like I said before, if this is the work of someone else I feel its wrong to be copying so closely someone else's style; a style which is known and respected and therefore could be used to this person's advantage unfairly. Its leeching off of someone else's reputation. Like I said before, if this is someone else they are a talent in their own right, and should do their own thing, their own way and in their own style.
Not only would that clear any suspicion, but it would also give them the push they need to be known around here. Right now, if this is someone else, we don't know it, and Hiro. M is getting the credit by default. Better for this person to come out and announce themself than to lead us on and get no credit for these great works.
@ AphxA- Don't worry, you won't be waiting or searching much longer. 😉