BuddyPress.org

Find the template for each situation and follow the code.

For example, for groups, create an overload of
buddypress\bp-templates\bp-legacy\buddypress\groups\single\members.php

In that file, remove the href on the avatar.
Replace bp_group_member_link() with a call to a custom function that you write in bp-custom.php.
In that function, add a check for the user’s role.

Example, untested, return link only if member is an admin

function ourweb_bp_group_member_link() {
   echo ourweb_bp_get_group_member_link();
}
   function ourweb_bp_get_group_member_link() {
     global $members_template;

     if( is_super_admin( $members_template->member->user_id ) )
	   return apply_filters( 'bp_get_group_member_link', '<a href="' . bp_core_get_user_domain( $members_template->member->user_id, $members_template->member->user_nicename, $members_template->member->user_login ) . '">' . $members_template->member->display_name . '</a>' );
    else
	   return $members_template->member->display_name;  
	}