Hi Deep, I’ll answer the Rhyzer question on your team mate first. you are right it will be much easier for him to swap to a rubber which he is comfortable with already but with more control so the swap from Rhyzer 48 to 43 for him would make sense as you suggested.
On the blades I would say it’s quite good to have a spare blade the same as your main bat, it means there is no adjusting when you have to use it in an emergency or as you say sometimes just in training. Also by having a second at which is different it can be tempting to swap about and then put doubt in your mind which is best. I know this myself as I have been changing blades and testing a couple of different ones the last few months. I’ve been going from an innerforce to ALC and viscaria too. The Apolonia ZLC is a very nice and well balanced blade and as you said very very similar to an innerforce. So if I was you I would stay with one of those as you know you like them and are comfortable with it as well. The ALC you may feel you have less control as it is more direct and has less feel than the Apolonia or innerforce as the carbon in those blades is deeper into the centre.
Any questions on that let me know!