Spikes for sure, think Hightower can develop it as well. Adrian Wilson should bring something to the party this year as well. There’s a fine line between having intimidators, and just having idiots who launch at people (cough Meriweather).
I do think in general the Patriots have a pretty physical defense, albeit not one that is scary. Wilfork especially is a dominant player in the trenches, and Tommy Kelly should make for a good combo with him this year.