There's an In port and a Out port, on all enclosures.
Cable from HBA to in port
Cable from out port to in port on the next.
If you have more you continou from out to in.
In the guide they take the upper HBA port, and put in the in port on the upper enclosure.
Then they go from the put port on the upper enclosure, to in port on the enclosure below.
and the next the next.
You only need to go out to in, once.
The other port of the HBA go to the other side, and start from the bottom.
HBA > In - Out > in .......
HBA > In - Out > in .......
BR
/jag