My question on grotesques with characters in transports.
The codex says that you can only have a grotesque transport if you have a character with them. How do you know that you will haa character with them when you are making your list? What if it the character is not reserve olled at the same time as they are?
Although its not a concrete answer we play it like this:
Haemoculi and Lords may start on the raider with grotesques when placed in the warp. They are considered one unit and only needs one roll for reserves. When the raider is cleared to enter the game both the Lord and grotesques are onboard.
There is no way to prove this and I would say there is probably more reason to believe you can't than you can but the logic here is strong that the grotesques wouldn't have boarded the raider in the first place if there wasn't someone there to lead them on. And since you can't have grotesques sitting on a raider without one then I can usually prove the Lord is on it and is attached to the squad to start the game.
Also, I still play it that the Lord can still separate once the raider makes planet fall (the grotesques are not a retinue). The only retinue that are grotesques are the uber grotesques for Urien.
Honestly,
no one has ever challanged this - it never been an issue as my opponents would rather see grotesques than wyches.
As for the "usefulness" of the grotesques current rules - I find them interesting and fun to play. They are not a "powerhouse" army but are more of a "shock troop" unit where you have to hit hard on the charge to either "break" your target or hit them hard enough that they can't hit back well. Yes, they really stumble against marines but have had excellent success against Eldar, Tau and Orks (can't say I ever used them against nids yet). You need to use large groups of them as they need to deliver as many attacks as possible.
I do agree their rules are outdated and odd but at least they are clear.