The thing is, seriously, that you are the one there who can assess the situation with Royell and it is hard to say whether he needs it without seeing him in action. You are the best judge of his condition. He sounds like he is doing well and just needs to recuperate and get his form and strength back. If this is the case then you don't want to keep giving medications for a long time as he is going to react to the medications and when he is well he needs just to get back to being the little
betta you know and love. He is not ready to be in the big tank yet, I agree he will just wear himself out dashing here and there. The smaller area confine a bit of the movement and also gives you the control over the environment a bit better than if he were with Burt and Ernie. Do another round of the Maracyns if you feel that you just want to be safe, but I doubt he needs them. He needs to rest and do some exercise in a controlled area and eat what he will and if he is not eating well at one time you can divide the meals into 3 or even 4 smaller meals if that will get more nutrition into him even if it is one worm at a time. I don't think I would worry too much about constipation unless he starts to eat better.
I do want to congratulate you for your ability on this. You did a fantastic job. I lost my very first fish and first Betta to dropsy and it was hard, so I know what type of work you had to do to make this work. I am so happy for you both. He is a real little fighter.
Rose
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He is still pretty weak and has a long way to go before he's going back into the 5 gallon with Burt and Ernie. I'm still going to treat him with the penicillin just to make sure the infection is completely out of him. His color is coming back little by little. He swims around pretty well, but he needs to build his muscles back up again. He has a little trouble with the current. I think he purposely swims in that corner a lot though because he wants to build his strength and muscles. He's determined to get better fast. He's eating pretty well. He ate 3 bloodworms this morning and I will probably feed him some pea later this afternoon. He is still very skinny too. I'm sure once his appetite gets better he'll start gaining that weight back. 
