That's one of the two ways I've seen it present, or rather three. Sometimes it starts as small, interveinal necrosis that does not reach the leaf margins, other times it starts at the leaf margins. ALWAYS the top leaves, always.
I've never associated burnt tips specifically with a Ca-, usually a P- or a N+ (P- will often also have reddened petioles along with darker green leaves, which can make the N Dx confusing because N+ is burnt tips with dark green leaves, but usually no reddened petioles).
Once I saw the interveinal necrosis expand very quickly to fully necrotize the leaf and into the developing bud, but I've only seen that in conjunction with a root aphid infestation and I've never seen it go that far since then. Root aphids really screw things up, as you already know, so at that point a Ca- was the least of my worries at that time, but since it was The White and I had already gotten to know her quirks in coir, I viewed it as possibly an advanced Ca-, almost akin to blossom end rot. It was ugly, too, I'll tell ya that much! Seeing what started out as perfectly good bud just go necrotic, outlining the calyxes with necrosis. The Ca tell for me was mostly that it only occurred on The White (who, by the by, was the only mother who got PM back after I treated with E20, my one and only time using it).
Does that make sense? I hope I'm making sense, because I didn't take pictures and probably should have.