... what would be different?

Would Ken still be there? Probably not. Would Alexander still be there? Probably, yes, unless evicted.

I think a lot of people would have come out of their shell more if he wasn't there.

It would have been a completely different house without Perez/Mario

Yes, it would be different....but not as explosive!
There would be arguments here and there (mainly down to Ken probably), but nothing like how it is now!
Glad Perez went in!

It certainly wouldn't be the Hopkins show...she had her chance to shine when Perez was in the secret room and failed spectaculously to do so. Missed opportunity.

Without Perez there would be less tension but also MUCH less entertainment.....it is this quality that redeems him to many here. I don't like the guy (i.e. who he is, what he does) but I find some of his more recent antics amusing.

I'm glad he entered but I think he has served his purpose now. I do wish he would leave but reckon he's here until the final.

it would have been similar - there are big characters in there who have just taken a "on screen" back seat

It would be hilarious if he won