I got your point yes - if Lillo is there as the supportive companion, a la the Brian Kidd role, great, but across the coaching staff there needs to be enough resistance to Pep's ideas, and alternative perspectives to ensure Pep can arrive at the best decisions, not just get blinded by his own ideas and fixations on certain tactics.
For instance - the inverted fullback thing has CLEARLY backfired and led to us conceding on many occasions - surely it's the assistant manager(s) job to be challenging Pep on that idea to help him see there are certain times to abandon that philosophy (they may be doing this and Pep is sticking to it anyway, it's just an example. The hesitancy around substitutions is another such area.)
I'm currently reading the new Pep Revolution book which is great for insight into how Arteta, Maresca, Torrent etc would formulate their own ideas and bring them to Pep, often challenging Pep's own instincts, to help him arrive at the best decisions. My question is is Lillo (or other assistants) doing enough of this? It's just a question, not a guilty verdict of him.
My main concern re Lillo is his inability to speak with the non-Spanish speaking players