I'm not sure this warrants an entire answer, but since it's part of the question and Richard didn't address it explicitly:
I also didn't understand how they believed Han had been "cheating" by also borrowing some money from the Kanjiklub. So what?
Let's do some financial analysis. Puttin on my Warren Buffett hat, there are TWO issues from the gangster's point of view:
This venture only has a finite possible payoff.
There is a chance that Han is embezzling the investment.
Usually, when you provide venture capital, you invest a certain amount, with a certain risk-adjusted expected return, and only invest if you expect to make a certain profit margin (given risk profile).
Let's say they loaned 50k credits to Han, each.
So, based on that, I see 4 possible scenarios depending on specifics of the business plan. I will list all 4 since the canon doesn't provide enough details to know which scenario actually happened or would happen.
Low margin venture, honest investment:
Death Gang expect the animals to fetch, say, 60k credits.
They get back their 50k, and - being very charitable - split the rest with Han, for 5k profits for each side.
If Han also borrowed 50k from Kanjiklub (and honestly invested all 100k into the operation), he and gangsters STILL only can expect 60k from selling rathtars.
That means that, instead of full repayment of principal and 10k profit, the venture is instead 40k in the red - which has 3 outcomes, none pleasant:
a. Death Gang have to fight Kanjiklub for their share of the 60k pie (of which they expected to get 55k, AND Kanjiklub expected to get 55k). Fighting is costly for business no matter who wins.
b. They negotiate honorably between thieves, and each eat 20k of loss. Lose/lose for them.
c. Or, whoever is the second to get to Han, will only be able to get Han's remaining 5k, losing 45k in the process (of course, the first ones to get to Han will get their original expected return of 50k principal+5k interest). The problem is, you don't know if you'll get to Han faster than your competing gangsters, so your risk is basically the same 20k of losses as scenario (b)
TL;DR: Han's actions took your expected return from 10% = 5k to a LOSS of 20k. That clearly is cheating!
High margin venture, honest investment:
Death Gang expect the animals to fetch, say, 150k credits.
They get back their 50k, and - being very charitable - split the rest with Han, for 50k profits for each side.
If Han also borrowed 50k from Kanjiklub (and honestly invested all 100k into the operation), he and gangsters STILL only can expect 150k from selling rathtars.
That means that, instead of full repayment of principal and 50k profit for 100% margin, the venture is instead only generating 50k total profit, split 3 ways (Han, DG, KK). This has 4 outcomes, none pleasant:
a. Death Gang have to fight Kanjiklub for their share of the 150k pie (of which they expected to get 100k, AND Kanjiklub expected to get 100k, which just doesn't add up). Fighting is costly for business no matter who wins.
b. They negotiate honorably between thieves, and each get equal profits and full principal. That gives each of them 25k return each (50%, or 2x less than what they expected) even assuming Han doesn't take his promised 50k.
c. Even worse, if Han takes his expected 50K and runs - the gangs EACH get only their principal back, and ZERO profit.
d. Or, whoever is the second to get to Han, will only be able to get Han's remaining 50k, which means ZERO profit. And since you have only 50% chance of being first, we are again at the risk-adjusted return same as #b (50% instead of expected 100%).
Basically, in the BEST scenario Han just slashed your risk adjusted return 50%.
TL;DR: Han's actions took your expected return from 100% = 50k to 50% = 25k, with meaningful possibility of zero return. **That clearly is cheating!
I won't cover the other 2 scenarios, where Han embezzles most of the money (50k or 75k), as they play out in very similar types of math. That clearly would constitute cheating even without math.
SUMMARY: Yes, it was cheating by Han.
Investee's Credit rating: Caa2 or CCC depending on whether you take Fitch or S&P.