I will second this for the same callow reasons. A goal threat from out wide is necessary if we play 4-3-3 and it would logically suit Mata if we play with a 10.
------Rooney-----
Depay--Mata-----
------------DiMaria
-----Herrera------
--------Blind------
Long-term, if we assume our front 3 is Rooney, Januzaj and another, Depay attacking from the left should suit Januzaj, who seems like he might be best narrow on the right moving around and linking up but still able to fade wide at times and just take on a fullback.