This whole discussion illustrates the downside of drafting BPA rather than for need. Much of Hightower's game overlaps Spikes' game rather than complementing it. Thus, you have Hightower playing out of position limiting his effectiveness, and his limitations in pass coverage only accentuates the problems Spikes has in that area.
It's not about collecting players; it's about building a team. You're better off with players whose skills compliment one another than you are having a mismash of specimens whose talents conflict with others. I'm convinced Belichick's fascination with versatile players is one reason there have been so many bad draft picks over the years. You want a safety. So, rather than drafting one who's either a good cover safety or one who's strong in the box, you draft Pat Chung who you think can so a little of both but turns out to not be able to do much of either.