The only explanation ? Nope. Because for me is always 30 sec no matter what. Your theory, based on nothing - so not a theory-, will be valid when you show me a good alliance cloning it above 50% HP or if the pop time is random for a given setup which is systematically disproven in my runs. For me the 30 sec is not an approximation, it is the exact second. With my new setup if it ever pops prior to 30 sec (I should be killing 33% faster, 50% with 5 monks and 1 smn) or if I ever see a clone at something greater or lower than 30sec or If I see it pop again above 50% HP we can talk about your "theory".