Hi Rene,
I am a little bit confused here. When you advertise a default route with EIGRP, normally the spokes already have a default route (static maybe) because they are connected to the internet. in this case the EIGRP default route will not show in the routing table as it has a higher AD. and at the same time we cannot remove the default static route as we need it for the internet and also to reach the Hub router. To me, advertising a EIGRP default route here does not make sense because it will not be used. i was wondering if we can see a real summarization example at the Hub where the spokes still can directly communicate. thanks