So currently the Arbiter has Suicide Grunts as his special units. I personally think that they could be replaced with a 2 Elite Squad like the ones seen in campaign. Now I am not sure exactly what could be their upgrades and power ups but I just personally think that is would be a much better Special Unit rather than Suicide Grunts.

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"May mother Sanghelios Watch over you."-Srax Zolak
[img]http://www.gruntsrus.com/tools/h3sg2/stored/cbc1bca88d57029109ab811bbe8c2547a77b8729.png[/img]