Adults dragons shed, typically about twice a year. Growth will of course increase sheds.
I believe it was I who said your dragon was chubby. I determined this due to the fat deposite sites on dragons. On the head right behind the eyes, those two large lumps, those are fat deposits. Around the armpits and base of tail are other fatty deposits. On your dragon all these areas are very well fleshed out. His arms and legs are rather chubby too. Personally I suggest cutting back on his food, so he looses some weight. Get a good scale and weigh him, post his weight and total length, will be able to judge better how much he should loose or if he is ok as he is. But I don't' think letting him gain weight will be healthy for him. Too much fat is just as harmful as not enough weight. Fatty liver diseases and other weight related problems us humans have, can and do affect bearded dragons.
For greens, what I suggest is try and find a good healthy staple green *collard greens, endive, dandelion greens, mustard greens, etc, check the food chart legend to see which greens can be feed daily), one or two of these staples, and mix with one or more other greens that may not be as good but are ok to have occasionally. The rare ones can be added once a month in small amounts.
I know there are some good Asian type greens and some bad, a few of the common ones we have available in North American are on that chart listed before. Bok Choy I think is a 'occasionally' green. Endive is a good staple, so you can use that one every day. Most squashes you can also feed every day but I recommend not to feed too often. Their high water contact can cause runny stools. However squash is really great to feed if you find your dragon is not pooping regular enough or appears dehydrated. I rather have softer stools and know he is well hydrated, than no or hard stools and have a dehydrated dragon. Not enough water can cause many problems, most not noticeable for a long time.
This is another good link, which shows pictures of what the greens look like. Some have many different names so seeing a picture of it makes it easier to identify in the store.
www.reptilerooms.com/Sections index-req-viewarticle-artid-98-page-1.html
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PHLdyPayne