This "Allen" isn't the same "Allen" we followed since the start... but it is still our Allen.
I don't have the diction to explain... but... just because he has the memories of lives lived from people that are and aren't him, doesn't mean he stops being himself.
The past Lavi and the original Allen... they are gone... memories inside the great flow of human conscience, and our Allen has inherited it.
Cross you not magnificent bastard... missed you, good to see you again.
Considering Road is there... and the clear magical circle right below Cross... this is "him", but a "memory" of him that Road has taken from the "dream", considering the "weight" of this memory, the damage she suffered by Apocryphos, she must have had to stay with him to keep him manifested.
Did this chapter just reveal that Cross is the brother of Catherine Campbell... which would make him the uncle of Nea and Mana?
We have fallen into a trap... you know which.