If you only have a standalone and plan to keep it that way, it doesn't matter which level. However, I would recommend sticking with one of the levels. Therefore, in your scenario, i would probably recommend making all changes at the MC level itself (Mobility Controller > Aruba7010_DC_F1_40). So, pick one, and stick with it. It is also useful to make all changes at the MC itself, because some of the settings, such as IP, will have to be made at the MC, so by making all changes at the MC, it will be less confusing.
If you add another MC to provide redundancy for the standalone, you technically still only have one logical MC, the other would function strictly as a standby, so again, it would not matter.
If you had multiple MCs either in a Master Controller Mode (MCM) environment, or a Mobility Master (MM) environment, then it can be useful to make changes at different level.
I hope this helps,