Disagree Joe. Very much against EDI's interest, in the short term at least, for its owners not to be developing it, even worse to be pushing an alternative. Those of us who care about it's future should therefore be hoping that the sale goes through pdq.
BAA are hardly likely to shoot themselves in the foot by further developing EDI long haul when they broadcast the fact that GLA is Scotland's long haul gateway. If they did, it would be one almighty faux pax...
PS Not quite sure what you mean by a "tied airport"
Let's put it this way, if BA were to push any airport before EDI's impending sale, it would not be EDI.