Allowing for 10,000 to halve the Guardian Angel – that’s absurd. Excuses about using a lot of skeletons to break up the formation near the castle are just excuses.
For your information – thinning out the Guardian Angel by sacrificing weak units on it is almost always a losing move; maybe in 1 game out of 20 it makes sense, and even then, I’m not sure. But leaving various weak units to break up the formation near the main castle, secondary castles, and sometimes other key objects (stable, fountain) is actually a very good move.