You don't need a power that works once a round. There are better things than that:
Dual Strike 1w/1w
Marking Scourge +wis
Pitfighter or Lawbreaker's Doom(Dragon 370) - +wis
Either Tempest or Battlerager with temp hit points +2
WF +2
Valid points (if a bit situational), I might bump it up to an A, depending on other feedback.
I'd say footwork lure isn't any better than tide of iron.
But in practice, it is. The fighters with Tide of Iron can't seem to use it very well to provide flanks. But Footwork Lure can easily open up great flank opportunities to the rogue, without exposing the rogue as much to the enemy line. Mechanically, they do the same thing, but tactically, Footwork Lure is a knotch better.
Brash strike too is probably at best a B+. It's fine for some builds, but the combat advantage hurts; and it's not as flexible as cleave/tide of iron. It's primary advantage is great damage output, but it's worse than cleave vs. minions, and a Con-build will want crushing surge - so it's facing stiff competition.
It depends on the build. For a battlerager who is giving up weapon talent and a point of proficiency, it perfectly makes up for the lost attack bonus. I may have been a little too excited about this fix for Sure Strike. I'll consider knocking it down to B+.
Predator strike looks poor. No enhancement bonus to damage? Mediocre attack bonus? It's almost certainly only viable at high levels, when the beasts attack bonus catches up somewhat, but the damage will never be great. I might be missing some feats or trick that improve it, however. Certainly at low levels it's not much good.
At low level, your Wisdom modifier is what makes up for the enhancement bonus to damage, and you can usually give your beast companion a flank. It didn't seem too different than Sly Flourish, but I guess not using a weapon, you're not getting any weapon focused magic or feats, which makes it a bit worse. I'll gladly knock this down to a C.
Both new powers are indeed mediocre. If Brash Strike actually ever works, an opponent won't fall for it again, and then it's just a melee basic attack. Essentially, it can only ever be better than a melee basic attack if enemies are stupid, and the basic attack of an enemy is less useful against you than your allies basic attack against him. That's rare; monster basic attacks are good and PC attacks are poor. You'll generally only win if somehow your AC is very good, or the monster's AC is poor, or you have a rogue or ranger that for some reason didn't get sneak attack/ hunter's quarry in. However, most rogues/ranger will try that every round, so even with a rogue or ranger in the party, this power is situational and still only any good against unwise opponents. I'd say Brash Assault is worse than opening shove - maybe a D, no better. Opening shove is weird, but at least in some circumstances it might be a real benefit. Brash Assault is almost never any good.
Brash Assault makes me scartch my head also. I haven't seen it or anything like it in action though, that's why I was giving it the benefit of the doubt. For a moment let's assume monsters will always take the attack. I think it becomes a question of how outnumbered you are. If you and an ally are outnumbered 4 to 2, that means enemies take 4 attacks against your 2. Changing that ratio to 5 attacks verses 3 is beneficial. However if you outnumber the enemy 2 to 1, you're giving them an extra attack, changing your ratio to 3 to 2 which is advantageous for the enemy.
Once the DM figures this out, it's easy enough to make the quick calculation and essentially always screw the player. I'll knock it down to a D.
Thanks for the feedback.