Oh, look at Luke taking up for Simon and spouting how loyal he is. Everyone knows that Simon is a younger version of Luke, if not in looks, then complete obsessive batshittery. Oh, Simon hasn’t killed anyone yet, not unlike Luke who basically killed the pack’s previous Alpha so he can use the Alpha’s betas as canon fodder for the battle against Valentine back in ‘City of Bones’.
But I’m convinced that he was way on his way to Luke’s sociopathy. Simon was never loyal to Clary. Clare, never mistake obsession and possessiveness as loyalty. Although this can’t be confirmed, my own headcanon for this is that Simon has been obsessed with Clary since they were children.
Simon even admitted way back in ‘City of Bones’ that he thought if he was friends with Clary long enough that she would reward him with getting in a romantic (and sexual) relationship with him. Just like Luke thought about Jocelyn, especially after he found her after she left Idris.
So yeah, I find it hilarious and just a bit sick that Luke is taking up for his counterpart.