"And just the other day, the voice of Tigger passed away."
Hmm yes and I suspect foul play at work. Someone is bumping these guys off. Peter Cullen, The Voice Of Eeyore, needs immediate police protection.
I suspect that owl.
Nah, Hal Smith played Owl, and he died back in 94. I'm leaning towards Clint Howard (he played Roo) or Jon Walmsley (Christopher Robin). Walmsley though - he may be trying to make a come back some how.