Unemployed man can't close on a home purchased 2 years ago from a developer. What are his options? - 1

Hello,
My friend purchased a pre-sale (pre-construction) home in Canada 2 years ago. He bought it from a reputable developer who will finally complete the project in a few months (took a long time as it is a new neighborhood with hundreds of new homes like the one he bought).
He does not have the same job he had when he got his pre-approval from the bank at the time of signing the deal. In other words, he is not sure if he can qualify for a mortgage.

A few additional facts:

- The mortgage pre-approval he originally received expired after 1-2 years.
- He paid about $50,000 deposit so will only need another $25 in order to close which he has. Well, IF a bank approves his mortgage.
My questions are:

1. Is there usually a lot of flexibility by the bank in a case like that (perhaps legally by law there has to be?) meaning even if he lost his job, since he put a large deposit and did get a pre-aproval (and still has excellent credit history), same bank will probably give him a mortgage?

2. Can a buyer like my friend usually assign the deal to another purchaser, and there is flexibility in terms of time and option to sell so he does not lose his deposit and upside? In other words, are developers usually ok with that when an original purchaser who paid a deposit can no longer get a mortgage?
THANKS

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