Formation width conjecture for $abc(acb)^t abc$

Let $t$ be a nonnegative integer, and let $\mathit{fw}(u)$ denote the formation width of a sequence $u$. Formation width conjecture.

$$\mathit{fw}(abc(acb)^{t}abc)=2t+3.$$

The paper states that this would imply nearly tight bounds on the extremal function $\mathit{Ex}(abc(acb)^{t}abc,n)$. The conjecture extends the proved result $\mathit{fw}(abc(acb)^t)=2t+1$ for $t\geq 0$; its resolution is not given here.