No cash upfront, equity is somewhat preserved and the rest becomes a source of potentially passive income.
Note. He has to leave. The situation is now untenable.
Depending on how the investor looks at this that is not a run race, it may very well be the investor that sides with the OP and together they may be able to kick out the aggressor.
Meanwhile, at most the company can generate $5K a month in revenues. That’s not a business, that’s a part time job with a partner you cannot trust.
Also, seen from the other side: They made a contract offering 40% in four years (conditionally) - most importantly only relevant when the company/idea survive that long and are thus profitable/worth something. Why should they suddenly pay this (or a meaningful fraction?) out after one year? Or give an "outsider" 40%, which will most certainly be difficult to explain to future investors?
That doesn't mean they'll only get 40% after 4 years.