1. Only one localbtc to buy coins.
2. Send from localbtc to bc.info Wallets A and B
3. b.info Wallet A sends to Electrum A
4. b.info Wallet B sends to Electrum B
Would electrum A and B still have linkage due to the original localbtc wallet?
Yes, albeit a weaker one since there's an intermediate transaction in between.
What would a better method be?
I thought that when you transfer btc to and from a web wallet, such as blockchain.info, the coins that get transferred out are not really the same ones you put in. They are a random bunch of coins from the pool which blockchain.info is holding ofr its users.
Wouldn't that mean that the coins coming from bc.info A and B would not be related to the original localbtc wallet as they are not actually coins that came from there.
Consider using the Send Shared or Shared Coin mixer at blockchain.info to anonymize your coins and put the anonymous mixed coins in a new wallet to avoid taint, see the guide to sending bitcoin anonymously.