In 2006 it took only 3000 hezbollah men to defend the south, in an upcomming war hezbollah will have over 10,000 men to fight, so if they split thier fighters as 9000 defending while 1000 go on sabotage attacks in northen israeli allowing the syrians to take the golan heights, then a swift withdraw of the surviving 1000, hold out till it stops and declear victory. No?
Hezbollah fighters were able to do this in 2006 because of ridiculously strong interior lines of communication and movement that had been built up for years with the express purpose of defending against and Israeli armoured and air attack. Consequently, it was very good at doing this.
For this reason, Hezbollah would be unable to replicate this success in an offensive attack against Israel. Because Hezbollah relies entirely on light infantry, the moment they leave the protective curtain of their infrastructure they become vulnerable to Israeli strengths. Hezbollah would also just simply be unable to sustain operations for more then a day just because they would have no way to resupply their fighters in Israeli territory.
Also, Syrians don't have a hope of seizing the Golan, that's just all there is to it. There's no way Syria has the political will to launch an attack.
Is syrias army that bad?
Short answer - yes.