Who was the only player not at OTAs?

Spikes is entering the final year of his rookie contract. Before you start thinking of a possible hold-out by the young LB, just know that Boston.com also reported that Spikes WILL be in attendance when it becomes mandatory by the team. So if a contract dispute may not be the issue, then why is Spikes not with his team?
Some players prefer to conduct their own training regime. Yes, OTA's give you time to adjust to the new group of teammates and coaches that you will be with for the upcoming season, but injuries could be another concern. So far, Michael Crabtree and Arian Foster have already sustained injuries, with Crabtree's predicted to keep him out the entire season.
Although this is rare and basically a freak accident due to the practices' light-hearted nature, it was maybe something Spikes considered while preparing to entire the final season of his contract. Do not read too much into his lack of attendance at an optional practice though. Spikes will be there when it counts.
Anthony Aidonidis
@aidonidis18
#BOOM