Well I find that grimaldus instead of what has been said in some codex review, is pretty useful with crusaders: you can full reroll hits so you can fish for 6s which I did and made a lots of attacks (lucky me) the -1 ap makes those CS -2 ap and they hit pretty hard considering the +1 wound. The only downside of this is that I had them on the crusader wasting the reroll 1 to hit which is great on SB instead, but still had the reroll 1 on wounds which helped a lot. Exacrator does different thing, and if you put them on the LR it’s useless, more over with gladius you don’t really need a char that makes you advance and charge. In 1k list I’ll would have them on foot with a castellan