Over the years there has always been a lot of talk about reducing cash reserves.
If you start a new account with 50% cash I believe you can handle a 50% downturn. If the market goes up a bit first you will have even more cash. There would be plenty of cash for a down market. It is only when you start An account with less cash or manage an account to limit cash increases that you have an issue. I assume Aim is wiser than I am.
If I wasn't Aiming, I would be tempted to cap my stoch holdings at their present value and every time the stock value rose $5,000 I would sell that amount of stock and keep raising cash.