Answers to your questions are as below:
1. Well you can definitely assign licenses to your team member but you cannot manage any other plan on there Adobe ID. So if they purchase any different Stock plan on the same Adobe ID you will not be able to see that. But for this plan, yes you can see the usage.
2. Please see Common Questions, Adobe Stock for rollover information.
3. Yes, all images are listed on Stock as well.
Hope that helps!
Thanks for the full answer. It's a shame about the lack of roll-over on the bigger subscription plans, our usage tends to fluctuate so the roll-over on fotolia works really well for us, we'll probably need to stick with them for the time being but hopefully Stock will change as it develops.
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Rollover applies to both the 10 images/month and 40 images/month plans. You can carry over unused images to the next month for a maximum of 12 months.