"Hey team so they pick Sylas, so I would recomment...."
InstaLock
etc
Literally lock in every Champ he can shit on with fucking OP Ult if not Annoying Ult
At least Pick Zoe or Syndra or idk 
InstaLock
etc
Literally lock in every Champ he can shit on with fucking OP Ult if not Annoying Ult
At least Pick Zoe or Syndra or idk 
... you willingly want your team to pick syndra into that?
You assume that they both have and know how to play said champions.
He's best at stealing ults with AP ratios, you recommend Kai'Sa or Syndra? o.o
I'd rather people choose a champ they are familiar with over worrying about counters. Every champion you listed has a backup plan to unfavorable matchups. At worst those champions can still farm against them just fine and they win the trade against him if he is stupid enough to dive them.
P.S.: No one should be touching Zoe or Syndra if they do not play them, those are not easy champions to jump into right off the bat.