The source of the problem is the order in which calls are made.
In my initial version <?php echo $this->Html->getCrumbs(' / ', 'Home'); ?> <?php echo $this->Html->getCrumbs(' / ', 'Home'); ?> was called before <?php $this->Html->addCrumb('Rules', '/rules'); ?> <?php $this->Html->addCrumb('Rules', '/rules'); ?> which works fine until the views are cached.
Once they are cached only in addCrumb , it is called before getCrumbs .
This only partially answers my question. Since getCrumbs used in my .ctp layouts, it is not possible to reorder.
I posted this as an answer, and not as a note on my question, so that no one gets generosity for what I already wrote in the question;) If you can provide a solution to the remaining problem or find out if this is a mistake in Cake, I'm glad provide you with generosity.
Gundon
source share