BuddyPress.org

/*Disable gravatar*/
add_filter('bp_core_fetch_avatar_no_grav', '__return_true');

/*Disable gravatar extra function*/
function bp_remove_gravatar ($image, $params, $item_id, $avatar_dir, $css_id, $html_width, $html_height, $avatar_folder_url, $avatar_folder_dir) {

    $default = get_stylesheet_directory_uri() .'/_inc/images/bp_default_avatar.jpg';

    if( $image && strpos( $image, "gravatar.com" ) ){ 

        return '<img src="' . $default . '" alt="avatar" class="avatar" ' . $html_width . $html_height . ' />';
    } else {
        return $image;

    }

}
add_filter('bp_core_fetch_avatar', 'bp_remove_gravatar', 1, 9 );

function remove_gravatar ($avatar, $id_or_email, $size, $default, $alt) {

    $default = get_stylesheet_directory_uri() .'/_inc/images/bp_default_avatar.jpg';
    return "<img alt='{$alt}' src='{$default}' class='avatar avatar-{$size} photo avatar-default' height='{$size}' width='{$size}' />";
}

add_filter('get_avatar', 'remove_gravatar', 1, 5);

function bp_remove_signup_gravatar ($image) {

    $default = get_stylesheet_directory_uri() .'/_inc/images/bp_default_avatar.jpg';

    if( $image && strpos( $image, "gravatar.com" ) ){ 

        return '<img src="' . $default . '" alt="avatar" class="avatar" width="150" height="150" />';
    } else {
        return $image;
    }

}

Reasons being:
The code helps to disable the gravatar use in buddy-press avatar and cover-image while also removing that gravatar text wordings when editing the avatar and cover image
But the issue is am making use of a Buddypress Multiblog so this tend to cause issue with my avatar not being displayed in biography on post .

Thanks in advance.