I believe by turn 10 BK will starting moving on his own, so it gives you a better chance to get Ike in range to fight and then get rescued by a flier.

Bard feels so good in pvp. You hit a low health person with the silence arrow and say "No... no... stop healing."

It’s ok because Eik’s Savior only gives units magic save while Soren can give his allies ranged or close depending on the weapon!

Eik can never replace the squad!

Oh yeah I'm the same! I don't play the mode myself, I only select it to get an idea on how other players are building older units. It's surprisingly handy!

Obviously these build are probably more geared towards Summoner Duel content, but I imagine they're still useful for give him an edge in normal content.

Something I like to do is check the top ranking players In Summoner Duels to see what the the people maxing out their favor level are doing.

Some common trends I'm seeing are Armored Beacon for the Special, Earthwind Boost 3 for the A, Wily Fighter for the B Distant Counter Echo X skill etc.