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Yeah, he's in a wheelchair. But, I mean... if you didn't know about the grandpa .... if you saw that poster and didn't know anything about the movie... but knew a chainsaw was involved... and the poster features a man in a wheelchair.... I just think there's something kinda threatening/disturbing about the wheelchair in conjunction with chainsaws. Like, if you were attacked by a killer with a chainsaw, and he cut your legs off, you'll be in a wheelchair.
I'm trying to find something ominous about the poster if you didn't know who that was in the picture... if you didn't know who the grandpa was... what could you imagine as something scary about it then? The wheelchair is a symbol of being handicapped. Actually, it's kind of an interesting theme to Texas Chainsaw Massacre -- being handicapped. Leatherface is mentally retarded. That's a handicap.