Um...yeah...XTO was kind of Ponzi scam by the end. A much flatter Ponzi scam, but still. Just keep buying junk from anybody Simpson could find and hope that prices would keep going up to cover the reach on acq costs. Eventually bought Hunt and Dominion and those were garbage. Clock ticking. Thankfully for XTO execs XOM thought natgas was going to be $5-6/mcf in the future.
I'll give it to XTO, they had some very smart folks in charge of various parts of the organization, including Hutton who was the smartest of them all. They much more closely resembled an oil company that could compete in the US operationally. Its just very very hard to avoid falling into a trap when your goal is to grow 20-30% every year. Its kind of silly to blame XTO for XOM overvaluing them, but let's not pretend XTO would have been awesomesauce without XOM "interference".
XOM on the other hand has really been perplexing. Some nice folks. Some smart folks. But mostly just a cluster. Its like watching the US postal service trying to compete with Amazon. Is anybody surprised they have to layoff a bunch of folks and can't make projects work? Nope. Should be noted that Simpson and Hutton have seemed to run $1B into the ground at Morningstar etc in this environment as well.....
And yeah XOM CEO situation is odd, but again, the whole thing is perplexing, its just a bunch of folks looting what they can get before the iceberg is hit so he fits right in.