gistfile1.php

<?php
function jetpack_buddypress_tweaks() {
	if ( ! bp_is_user_change_avatar() && ! bp_is_group_admin_page( 'group-avatar' )  )
		return;

	add_filter( 'jetpack_photon_override_image_downsize', '__return_true' );
}

// This action is called by BuddyPress on "wp" at priority 10. If it's called, you can assume BP is loaded, but remember that a particular component might not be loaded -- you need to check if anything else is added here in the future.
add_action( 'bp_ready', 'jetpack_buddypress_tweaks' );