This is my humble opinion.
It doesn't really matter how much share you hold in the company, what matters is if you invested the 200K. It could give you 65% or 6.5% share.
I certainly believe the money should come from the original applicant or if it is coming from someone else, you should have proper documentation to show such money has been earmarked to be invest in the company on the main applicant's behalf. You know more like a "Third party declaration" for entry, but you need to find something similar for extension.
I have another scenario for you to think about, could be very similar to your husband's case. If an Ent visa migrant joined an existing company and invested only 100K, or even better just 10K for some share (again the % doesn't matter at all), and later the existing or new directors bring in more money, then the Ent can't claim points for extension for the money he/she hasn't invested just because the total investment went over 200K AFTER he/she joined. Unless of course, he can provide specific documentation that the extra money has been invested on his behalf, which sounds quite dicey!
Either way, it's quite a concern to panic if you haven't invested the full 200K and want to produce documentation that someone else invested on your behalf. Assuming you do, then you should have more share % equivalent to entire 200K not just the 65% (I am sure the other directors wouldn't agree to this). Because it's invested on your behalf, you should get the shares too.
I would sincerely suggest you to invest the rest of the money yourself to meet 200K and save yourself tons of headache, tension and many a sleepless night! And probably save a lot of money in solicitor's fee too.
If you find something different, please update here.