Five or more roots.
You have a real evidence base, and the count is now the wrong thing to look at. Breadth is settled. What it does not tell you is whether your sources described a decision or only a person.
Your next step. Before the vote, one director writes a single page from the file you already have: the decision this candidate owned that most resembles the one this seat will require, the reasoning they held at the time, what happened, and what they now say they would do differently. No adjectives. If that page cannot be written from eleven accounts and five roots, the gap is not independence, it is substance, and the next call is to whoever watched that decision happen.
Then write the root count down, dated, where the board can see it. In six months everyone will remember the conclusion and nobody will remember how well supported it was.
Two to four roots.
Ordinary, and workable if you know it. A board that knows it has three roots and proceeds is in a completely different position from one that believes it has eleven.
Your next step. Before the decision, one director makes one call to a counterparty the candidate did not choose. Someone on the other side of a table from him: a customer who left, a partner in a deal that came apart, the other side of a negotiation he won. Not the search firm, not staff. A director, with a name and a date.
Write down the sentence your current sources produced before you dial, then ask something whose answer would differ if that sentence were false. If the call would sound the same either way, you have added a voice and not a root.
If no one can name a counterparty, that is the finding. Record it.
One root.
You have one account, told to you repeatedly. Whatever you decide, you are not deciding on evidence yet.
Your next step. Take the list back before you make another call. Ask the search committee, in writing, for names sourced without the candidate’s involvement, and have a director place two of those calls before this goes on an agenda. One to a counterparty, someone who sat on the other side of a table from him. One to a person he reported to, who set his objectives and judged the result.
Not more references. Different ones. A ninth account from inside the same root will read like confirmation and change nothing.
This is one step out of a longer method, and it is the one that changes the most for the least effort. The rest — building the standard before anyone is scored, insisting on demonstrated decisions rather than stated philosophy, writing the case against as carefully as the case for — is what independent diligence adds. If the decision is coming, the time to build the record is before it.