Make a pro theme available to a basic member

I would like to make a pro (level 2) theme active for a basic (level 1) user. The theme is set for pro on the pro themes page. I thought if I went to "sites" in the network admin I could click "edit" on the desired site and then activate the theme on the "themes" tab. When I go into the desired site's dashboard it will not allow me to activate the theme.

Am I misunderstanding the function of this? I know there is a way to activate higher level plugins for specific sites. Is there no option like this for themes?

Thanks