We are on the OTP-PHX run but tomorrow's 8 am BA 6031 to London is delayed by 2 hours.
This will destroy our original itinerary as we only have a 2 hour connection in London for our flight to JFK and then further to PHX.

Question:
1. Would we get original routing credit independently on the routing which they chose for us to arrive in PHX
2. If we suggest a routing - would we still be eligible for original routing credit
3. If we arrive later than 4 hours with a routing suggested by us (LHR-JFK-PHX) - would we be eligible for the EU261 compensation?

Many thanks for your combined input!

For reference our original routing is

HEL-LHR AY1331/ BA6031 (delayed by 2 hours April 16 / noticed via test message and email)
LHR - JFK BA173
JFK -LAX AA53
LAX - PHX AA3258