Does the ground wire need to be continuous through the termination block?
The ground has to be continuous, code allows splicing with non removable splices that are rated for grounding.
There are many splices out there but not all are listed for grounding make sure the splice you get is listed for grounding.
The second thing is the proper compression tool. I have had inspectors that wanted “stamped” marks from the compression tool proving the correct tool was used, I haven’t had that issue for many years but be aware it could be and make sure you have enough wire to redo the splice if the inspector calls you on it (both the splice or the compression tool used).
You can not use terminal blocks from the electrode(s) the grounding wire can only be spliced with non removable means as compression or cad welding.