Seth Masia wrote:

This accident reminds me of last week's thread about spotting floatplanes
over Lake Sammamish. In this case the Cessna was in the pattern for Renton
and looking into the sun -- but the Beaver was in a separate pattern for
Wiley Post, the seaplane base off the north end of the Renton runway. Both
of these guys should have been talking to the tower and the tower should
have been watching out for both of them.

According to the TV link posted, both aircraft were talking to the tower.

George Patterson
Give a person a fish and you feed him for a day; teach a person to
use the Internet and he won't bother you for weeks.