Is this a legal Fibonacci heap?
It's not possible. You propose a root node with degree 4 and size 7 (including itself).

From CLRS 3ed pp 525:


  Lemma 19.4
  
  Let $x$ be any node in a Fibonacci heap, and let $k = x.degree$. Then $size(x) \geq F_{k + 2}$.


$$
\begin{align}
k &amp; = 4\\
F_{6} &amp; = 8\\
7 &amp; \ngeq 8\\
\end{align}
$$