If the leakage is related to the current well wouldn’t the pressure be starting to drop?
Eventually maybe. They have been concerned that the shut-in pressure that they have been monitoring the past 72 hours (6,700+ psi) did not rise as high as expected (8-9,000 psi). That could mean one of two things (and maybe some other harder to define things also). First, the oil reservoir may be depleting or there may be leaks.
There were two different reports circulating about the pressure. One said 6700 PSI and another said 1100 PSI. Who do we believe?
But ask yourself this. If there was no leak then why would then not be doing a top kill now that they have the cap sealed around the well head. I think the answer to that is obvious. They have leak underground, and they are well aware of it.