Lennox and fellow Texans and Hawke's Bay representatives Leopard and Todd Watson, are again displaying the benefits of a stint in Darwin with the Palmerston club.
Castle said Lennox is a bit more agile after losing some weight while in Darwin and bowled well for the Bay last weekend in Mount Maunganui.
"Jayden is doing a good job as captain of Tech and I'm sure he will do the same with us."
Hawke's Bay will also miss the services of New Zealand under-19 all rounder Joey Field who is injured and Brad Schmulian who is on Central Districts duty.
"We've got plenty of depth and we have had to go wider into our squad but I'm confident we will be good enough to get the job done," Castle said.
He expects Taranaki to play former New Zealand under-19 right arm medium pacer Ryan Watson who will have returned from his 12th man duties with Central Districts.
"We know what Taranaki will bring. We just need to be patient and make sure we do the job necessary to cope with what they will bring," Castle added.
The Hawke's Bay team for this weekend is:
Jayden Lennox (captain), William Clark, Matt Edmondson, Kyle Gardiner, Callum Hewetson, Luke Kenworthy, Christian Leopard, Angus McKnight, Ben Stoyanoff, Todd Watson, Bayley Wiggins, Luke Wright.