Savio - I though he was the most courageous player for the Hounds last year and they dodged a bullet because he literally took every face off and remained uninjured. I think PB has already mentioned this several times. Look at what happened to Towson late in the year when Woodall went down...and that game against Towson was probably Savio's worst. I think you'll also see an improved uptick in wing play for the Hounds next year.
I read one Post that stated that Olmstead could move to Middie - he's good enough to do it if that's what the Coaches feel they need. He played that position a few times last season if I recall.
The Coaches have players that can play and will put them in the right place. Unless some Attack phenom emerges we haven't seen I expect Olmstead to remain where he is. 
The other piece - who replaces Spencer? Well you don't really replace a Pat even up. It's going to take improved play by the entire offense to plug that hole. That is why I agree with PB that this team will have a new look and a new vibe. Players are going to step up their game because they know what is missing and Spencer could just singlehandedly take over a game and propel the Hounds. He's not there so it's their time to shine.
It's going to be interesting early in the season as the players, some new faces included, learn their roles and where and when (and how) they can contribute. The team will build its chemistry through out the season and I expect them to look and play really good in late April and May when it counts. I've got to think the Coaches are excited about this season too as they have something new to build upon - lax without #7. I can see them taking more chances on defense and the transition game with Spencer gone, and with Savio and crew performing better. I believe they are going to be excited to see how the team plays and responds.
The team is certainly going to look different and let's just hope it is a "good look"
And bank on whatever Peter Brown (PB) says.