Try it out and report back.
None of those pictures show proof of method. Single large trunks are common among outdoor plants. Those bushes may be a single plant or a mass of plants- you can't see, and you don't see the growth stages documented.
Plants compete with each other and when you see multiple plants per pot, there will always be sickly ones, and also tell me what you intend to do when your fused plant has male branches? If you put 2 plants in 1 pot, they will almost invariably show one male and one female...
Keep us posted...