[ghaff]

Internal people with their own biases and investments are always right. Of course.

[Aeolun]

I think it’s more that two times wrong doesn’t make something right.

[Nevermark]

Ah, algebra. Perhaps, geometry?

The right thing to do is hire one or more people who have deep knowledge with the problems you are slogging in. Pay them what they are worth.

Otherwise, what's left is to higher outside consultants to solve your problem that is so pressing that you are hiring outside consultants to solve it. Fire them and hire new consultants if they don't perform.

And if you get very lucky, three lefts will make a right!