Linsday I would repot this plant into new potting mix ASAP if I am seeing the photo correctly with roots on the surface. Prepare a nice pot with fresh mix, and lift the whole plant from the pot. With you fingers, gently untangle the roots--if I am right, then it will just be a big mass of roots. If so, you will inevitably tear some while untangling but it'll be fine. Before I even lift it out of the pot, I would cut here and here (as shown below), closer to the leaf above the line than the leaf below the line. Take the untangled main stems you have and plant them into the new pot. DO NOT WATER just yet. Then from the four sets of cuttings you have, gently pluck off the bottom set of leaves. Let it rest a day in the shade or indoors. In a day or two, stick the cuttings into the new pot of soil with the main plants already planted, ensuring the two areas where you removed the last leaves are in the soil securely. You may need some rocks or something to prop them up properly for a couple of months until they grow enough roots. But they'll be a lot shorter and easier to prop up. I would water in about 2-3 days from that point though many will tell you to go longer. Up to you. :) Jades are super easy to propagate. Once or twice a month, lightly feed it with good fertilizer and you should be set to go. If you're going to place it outside, then make sure you do it slowly, giving it a tiny more light per day until it's in the spot you want or you will burn the whole thing to a crisp. But all of that I would do after the cuttings have had a chance to heal--in about two weeks or so. I find that jades need a little more water than typical succulents but your mileage may vary--depending on the soil you use.

Botanical name of money tree is Pachira aquatica, with the aquatica referring to it's need for damp conditions. Did you remove the old, mushy companions in conjunction with repotting? I don't see any stumps. For putting outside, I'd use a much bigger pot for that size plant, so it doesn't blow around. A clay pot would help add weight to the base and keep the center of gravity lower. Your soil looks like it has plenty of perlite in it so you should be able to keep it moist without risking rotting the roots (overwatering.) Dieffenbachias don't mind a longer interval between waterings.

I can't see any obvious yellow leaves in your photo, so perhaps it is just normal leaf shedding where your plant is shedding old leaves. In general, you do have to be careful not to overwater these guys. Because they have fleshier leaves, they tolerate underwatering a bit better than leafy plants. I let my potting mix dry out a little (but not as much as I would with succulents) between waterings. My Peps tell me they are thirsty when their leaves start feeling a little floppy. I've heard they'll tolerate low light, but I haven't tested that out myself. If it's not getting as much light, you'll probably have to water it less as well. I'm still a newbie to fertilizing so I'll leave that to someone with more experience to answer.

Echeverias especially like a lot of light (that's the first one). BUT if they were not previously used to full sun, you will have to work your way up to it (slowly). Introduce them to more sun every few days, until they are in the sunniest spot you can muster. I can't help on the first one (besides that it is an Echeveria), but I think the second one is an Aeonium 'Kiwi'. I don't have any Aeoniums, so I can't say on light requirements.