When a user withdraws(turns in shares), the assets are withdrawn from
1. a strategy most off from its ideal balance and whose balances are greater than its ideal balance (a.k.a most sufficient strategy)
2. if the strategy from step 1. did not suffice then a strategy that has the most balance irrelevant from its ratio (a.k.a most locked strategy)
3. if the strategy from step 2. did not suffice, the transaction fails.