in finals of MOTH 1, Daut played FC vs Riut's flush, and I noticed Daut proceed almost always to castle, even drush failed and he had forward wood and gold. Only map he didnt go FC was when he had some really opened map and when he saw he was forwarded. Riut, as one of best Arabia player of all times, mostly flushed and defended by walls in these games... but still Daut's FCs were complete successes, he was always in some advantage.
I cant speak about strategies, as I am not competent. But, logically, after failed drush, flusher would have some little advantage because somewhat control of map due holding of enemy villagers to develop eco. But in the other hand, in Castle age power of workshop and, TCs defense, are also good strategic resources.
can you put a link to the rec pls?