ThanksFor point 2, it depends on how your funds is made available to you. If the funds is without restrictions and can be made available to your own account, then its possible for you to opt in for an SDS. Even though if it's not, but was/has paid your 1yr tuition fees + GIC, you can still opt in for SDS.
The only reasons I see is if you just showing the loan letter without full accessibility then its not advisable to opt in for SDS