Another inconsistency?

[Carol]

No: HPFGUIDX 176363

I thought Fenrir had a dark mark?
> > 
> > During the tower scene at the end of HBP, a group of DEs join DD,
Harry and Draco up on the top of the tower, and the rest of the OotP
can't get up the stairs due to some magical wall except for Snape.  At
the time, the reasoning for this was that only people with Dark Marks
could go through the invisible wall.
> > 
> > However, in DH, Fenrir cannot enter the Malfoy Manor, even though
it appeared you needed a Dark Mark to go through the gate (like Snape
and Amycus in the first chapter).  Also, he couldn't summon LV 
because he didn't have a Dark Mark and was relying on one of the 
Malfoys or Bellatrix to call him.  <snip>
>
Carol responds:

As I wrote offlist to another poster, I'm sure that the blocking spell
was cast when the DEs were already on the stairs and Draco was already
on the tower. Fenrir, who was already on the stairs, would not have
had to go through the barrier; only Snape did. (The Order members were
blocked.)

Admittedly, the spell is cast when Harry is on the tower and can't see
what's happening below. However, this bit suggests that the spell was
put in place by the DEs after they were on the stairs rather than by
Gibbon, who cast the Dark Mark but has been dead for some time at this
point:

"There was a bang and shouts from below, louder than ever; it sounded
as though people were fighting on the actual spiral staircase that led
to where Dumbledore, Malfoy, and Harry stood" (HBP Am. ed. 590). Two
pages of dialogue later, four DEs come "thundering" up the stairs
(592). Since no Order members (except Snape) follow, it's clear that
the barrier is in place by that point.

When Harry runs down the steps, leaping the last ten, he finds that
"half the ceiling seemed to have fallen in" (598). There's no mention
of a barrier; he's not aware that one was erected at that point.

The first reference to the barrier comes from Tonks, who says that
Draco vanished and more DEs ran up after him, "but one of them blocked
the stair behind them with some kind of curse" (620). The time frame
is unclear, but it's after Gibbon's death and after Draco has run up
the stairs.

Neville and others try to break through the barrier and can't, but
Snape runs right through it. Lupin tries to follow and is thrown back
(620). Then the big blond DE (identified in DH as Thorfinn Rowle)
causes the ceiling to fall in "and also [breaks] the curse blocking
the stairs," according to Lupin (621). Snape and Draco emerge out of
the dust, followed by the DEs, and the fighting starts up again. At
that point, Harry himself leaps down the stairs, so we don't learn any
more about the barrier, but it doesn't matter since it's no longer in
place.

At any rate, it seems as if the battle starts out in the corridor and
the barrier is not put in place until the DEs start up the stairs. If
that's correct, then neither Fenrir nor Draco ever passed through it.
Only Snape does, which would seem to confirm Harry's theory that a
Dark Mark is required and that a spell similar to but not identical
with the one on the Malfoys' gate was cast on the stairs, probably by
Yaxley rather than the Carrows.

Carol, who thinks that Draco most likely has a Dark Mark but Fenrir
clearly does not