Si se combinan. A ver que te pongo los textos para explicar el timing:
Diving Tackle (Agility)
The player may use this skill after an opposing player attempts to dodge
out of any of his tackle zones. The player using this skill is Placed Prone
in the square vacated by the dodging player, but do not make an Armour
or Injury roll for them. The opposing player must then subtract 2 from his
Dodge roll for leaving the player's tackle zone. If a player is attempting to
leave the tackle zone of several players that have the Diving Tackle skill,
then only one of the opposing players may use Diving Tackle. Diving
Tackle may be used on a re-rolled dodge if not declared for use on the
first Dodge roll. In addition, if Diving Tackle is used on the 1st Dodge roll,
both the -2 modifier and tackle zone still apply to the Dodge re-roll.
Tackle (General)
Opposing players who are standing in any of this player’s tackle zones
are not allowed to use their Dodge skill if they attempt to dodge out of
any of the player’s tackle zones, nor may they use their Dodge skill if the
player throws a block at them and uses the Tackle skill.
Placaje Defensivo habla que si estás en las zona de defensa de un tio he intentas esquivarle...no podras usar tu habilidad Esquivar en ese intento de esquiva.
Esto es...tu gutter está adyacente a mi jugador...e intenta esquivar...por tanto...se cumplen los requisitos para que no puedas usar Esquivar.
Y Placaje Heroico habla de que un jugador (tu gutter) que intente esquivar desde la zona de defensa de un jugador con PH puede sufrir un -2 si el jugador con PH se coloca tumbado (sin necesidad de tirar por armadura).
Además aclara que aún repitiendo la tirada de esquivar se asume que tienes que salir de una zona de defensa (la que te ponia el tipo que ahora está tumbado) y se sigue aplicando el -2. Este punto creo que es el que más te aclarará la duda :p
Un saludo