Firefighters and local people covered the distance to commemorate the 72 people who died.
Taxpayers "incorrectly footed the bill" for cladding replacement, a tribunal hears.
A law that would fund a memorial to those who died in the 2017 fire has passed through House of Lords.
Nearly 300 people were evacuated from the flats after a fire in August 2024.
A group representing the bereaved of Grenfell call Simon Dudley's comments "ignorant and callous".
Joseph Brown says the charges for his flat will increase by about £1,500 a quarter from April.
As MSPs vote on proposals to fund repairs to unsafe claddings, residents say they are still waiting for action.
The team has grown in numbers over the years and now involves more than 220 investigators.
Half of Wales' tall buildings await surveys or for work to start, almost nine years since the disaster.
