Should i replace Rassad?

As the title states should i replace Rassad because right now for me hes only level 3 and can hardly take a beating but if you say i should who should i replace him with heres my current party
Me (a gnome lvl 3 illutionist/lvl 4 thief)
Khalid lvl 4
Jaheria lvl 3 fighter/ lvl 3 druid
ajantis lvl 4
nerra lvl 4 wild mage
rassad lvl 3 monk
Me (a gnome lvl 3 illutionist/lvl 4 thief)
Khalid lvl 4
Jaheria lvl 3 fighter/ lvl 3 druid
ajantis lvl 4
nerra lvl 4 wild mage
rassad lvl 3 monk
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Comments
If you want to do his quest and know his story you can keep him, though I would probably change him.
I would go for Yeslick if you want a Good party, perhaps. More tanking and more healing or even Minsc if you want a really heavy hitter that is also funny.
In BG2, Rasaad turns into a powerhouse. In ToB, he turns into a battle god.
Dudes at playithardcore.com do a much better analysis than me.
Rasaad
STR DEX CON INT WIS CHA Race Class Alignment
16 16 14 11 14 14 Human Sun Soul Monk Lawful Good
Special Abilities: None outside of default monk abilities. Equipped with Moonlight Walkers: boots that grant +2 AC wearable only by Lawful Good Human Monks.
Starting HP & Proficiencies: Level 1: 8 HP, one pip in Katana and Scimitar/Ninja-to/Wakazashi. If you pick him up later on, he'll have a pip in slings as well.
Required Actions: Just talk to him. Fulfill his quest line
Location: Just outside the Nashkel Inn.
Ugh. Just ugh. What an abysmal NPC. Monks are really bad at low levels, even at the max level obtainable in BG1. He also has horrendous stats, and if you pick him up pre-level 4 he doesn't even have a proficiency in a ranged weapon so you can keep him safely in the back and at least contributing to fights. He brings nothing to the table outside of new dialogue and a quest line that yields some very good gear. The gauntlets of ogre power are a must so he can actually land a hit in melee and deal some decent damage. If you're looking for a character that's actually useful in battle, skip him because he's bad, bad, bad, bad, bad. As of version 1.2 he has been made into a Sun Soul Monk. I wouldn't recommend using him in a hardcore run still. He now has a few decent abilities like Sun Soulray (which he can use to hit multiple enemies from range) and Flaming Fists. But overall he still comes with most of the problems monks have.
http://playithardcore.com/pihwiki/index.php/Baldur's_Gate:_NPC_Rundown
Given the rest of your party, what you're conspicuously lacking is a Cleric. In addition to helping Jaheira with healing, Clerics have some good spells which a Druid doesn't get, and they can wear good armour and stand their ground in a fight. I agree with @elminster, Branwen would be a good choice for you.