WB should've taken an initiative to check Oden , unless he was so pissed because Oden switched to Roger's crew .
I can also buy that Whitebeard was so upset that Oden ditched him he refused to get back in touch with him and didn't know he'd died
Squardo outright betrayed Whitebeard and stabbed him through the torso with a sword. In return, Whitebeard gave him a hug and forgiveness on the spot.
For Whitebeard to refuse to care for Oden for 20+ years simply because Oden decided to hitch a ride with Roger for a while, would be a crippling character contradiction.
You know how Wano's border works. It has a hidden mechanism preventing Oden's friends from hearing any news or speculating ... anything. That's the whole reason behind Oden wanting to open that damn border.
You do not think that any one of those folk amongst the Whitebeard Pirates who met Oden would find it suspicious that he never did so? In over two decades? Especially after Ace visited the place personally and saw nothing but poverty and destitution?