Well, you all started at the beginning of the scenario. Sisu Aviation has been grabbing quite a lot on the used market not worrying too much about fleet comm. and age. Some of the DC-9s are pretty old. While also going into long-hauls early on. Prestige appears to have focused on huge pax planes and putting them on shorter routes. I believe that main difference to your airline (Dominos) is that the others are flying a lot of monopoly routes, where they have no competition (cash cow!) and that they have kept their fleet comm. much better in line than you have. Sisu flies now 20 a/c with 5 fleet types. Prestige 9 a/c with three types and you fly 3 a/c with three types(!!). I cannot see the early months anymore, but I assume they have kept that ratio down even further at the beginning. Another factor might be CI, although I cannot tell from the outside where they are right now.
But so generally speaking, yes, that is absolutely possible, and I would perhaps even say that 20 a/c right now at an airport like Shanghai is not really a lot. I had a similar situation at Istanbul, if you want to take a look, although one of the competitors has gone bankrupt in between and was reborn and now going down again, doing the same mistake again. We all started at the same time, but took a very different approach to growth and solid financials, I guess.
But please feel encouraged to discuss your observations here, I am glad, if I can help you out with anything.