This was just a fun, quick mockup without a ton of thought. But no, those players wouldn't break into the top XI if we actually added Pirlo, Drogba, and Iraola.
I like both Poku and Shelton best off the bench anyway. Shelton biggest asset is his pace, and is otherwise pretty average all around. Poku definitely has potential to be a regular starter, but needs to round out some deficiencies in his game. When he plays, he makes some notable dribbles, but I don't see much from him in off-the-ball positioning, defensive skills, or even distribution (aside from some flashes.) Both are best as sparks off the bench to move the ball forward quickly in late-game situations.